Hi Bettina,
this is the error deactivating all plugins, except those of TAGDIV.
I’ve also checked with 8.1, but I receive also some errors in the backend.

Fatal error: Uncaught TypeError: number_format(): Argument #1 ($num) must be of type float, string given in /web/htdocs/www.rottadeitrasporti.it/home/wp-content/plugins/td-social-counter/shortcode/td_block_social_counter.php:1142 Stack trace: #0 /web/htdocs/www.rottadeitrasporti.it/home/wp-content/plugins/td-social-counter/shortcode/td_block_social_counter.php(1142): number_format() #1 /web/htdocs/www.rottadeitrasporti.it/home/wp-content/plugins/td-composer/legacy/common/wp_booster/td_global_blocks.php(27): td_block_social_counter->render() #2 /web/htdocs/www.rottadeitrasporti.it/home/wp-includes/shortcodes.php(355): td_global_blocks::proxy_function() #3 [internal function]: do_shortcode_tag() #4 /web/htdocs/www.rottadeitrasporti.it/home/wp-includes/shortcodes.php(227): preg_replace_callback() #5 /web/htdocs/www.rottadeitrasporti.it/home/wp-content/plugins/td-composer/includes/tdc_composer_block.php(278): do_shortcode() #6 /web/htdocs/www.rottadeitrasporti.it/home/wp-content/plugins/td-composer/includes/shortcodes/vc_column.php(316): tdc_composer_block->do_shortcode() #7 /web/htdocs/www.rottadeitrasporti.it/home/wp-content/plugins/td-composer/legacy/common/wp_booster/td_global_blocks.php(27): vc_column->render() #8 /web/htdocs/www.rottadeitrasporti.it/home/wp-includes/shortcodes.php(355): td_global_blocks::proxy_function() #9 [internal function]: do_shortcode_tag() #10 /web/htdocs/www.rottadeitrasporti.it/home/wp-includes/shortcodes.php(227): preg_replace_callback() #11 /web/htdocs/www.rottadeitrasporti.it/home/wp-content/plugins/td-composer/includes/tdc_composer_block.php(278): do_shortcode() #12 /web/htdocs/www.rottadeitrasporti.it/home/wp-content/plugins/td-composer/includes/shortcodes/vc_row.php(1145): tdc_composer_block->do_shortcode() #13 /web/htdocs/www.rottadeitrasporti.it/home/wp-content/plugins/td-composer/legacy/common/wp_booster/td_global_blocks.php(27): vc_row->render() #14 /web/htdocs/www.rottadeitrasporti.it/home/wp-includes/shortcodes.php(355): td_global_blocks::proxy_function() #15 [internal function]: do_shortcode_tag() #16 /web/htdocs/www.rottadeitrasporti.it/home/wp-includes/shortcodes.php(227): preg_replace_callback() #17 /web/htdocs/www.rottadeitrasporti.it/home/wp-content/plugins/td-composer/includes/tdc_composer_block.php(278): do_shortcode() #18 /web/htdocs/www.rottadeitrasporti.it/home/wp-content/plugins/td-composer/includes/shortcodes/tdc_zone.php(591): tdc_composer_block->do_shortcode() #19 /web/htdocs/www.rottadeitrasporti.it/home/wp-content/plugins/td-composer/legacy/common/wp_booster/td_global_blocks.php(27): tdc_zone->render() #20 /web/htdocs/www.rottadeitrasporti.it/home/wp-includes/shortcodes.php(355): td_global_blocks::proxy_function() #21 [internal function]: do_shortcode_tag() #22 /web/htdocs/www.rottadeitrasporti.it/home/wp-includes/shortcodes.php(227): preg_replace_callback() #23 /web/htdocs/www.rottadeitrasporti.it/home/wp-includes/class-wp-hook.php(308): do_shortcode() #24 /web/htdocs/www.rottadeitrasporti.it/home/wp-includes/plugin.php(205): WP_Hook->apply_filters() #25 /web/htdocs/www.rottadeitrasporti.it/home/wp-includes/post-template.php(255): apply_filters() #26 /web/htdocs/www.rottadeitrasporti.it/home/wp-content/plugins/td-composer/legacy/Newspaper/page.php(51): the_content() #27 /web/htdocs/www.rottadeitrasporti.it/home/wp-includes/template-loader.php(106): include(‘…’) #28 /web/htdocs/www.rottadeitrasporti.it/home/wp-blog-header.php(19): require_once(‘…’) #29 /web/htdocs/www.rottadeitrasporti.it/home/index.php(17): require(‘…’) #30 {main} thrown in /web/htdocs/www.rottadeitrasporti.it/home/wp-content/plugins/td-social-counter/shortcode/td_block_social_counter.php on line 1142

Notice: ob_end_flush(): Failed to send buffer of zlib output compression (1) in /web/htdocs/www.rottadeitrasporti.it/home/wp-includes/functions.php on line 5279

Notice: ob_end_flush(): Failed to send buffer of zlib output compression (1) in /web/htdocs/www.rottadeitrasporti.it/home/wp-includes/functions.php on line 5279

… while with 7.4, debug mode and logged in in WP, opening the preview of the site, I only receive this error string, but the site runs

Warning: number_format() expects parameter 1 to be float, string given in /web/htdocs/www.rottadeitrasporti.it/home/wp-content/plugins/td-social-counter/shortcode/td_block_social_counter.php on line 1102

Hello Bettina,
with PHP 8 the website shows only a boxed version of the header and then this list of errors.

Fatal error: Uncaught TypeError: number_format(): Argument #1 ($num) must be of type float, string given in /web/htdocs/www.rottadeitrasporti.it/home/wp-content/plugins/td-social-counter/shortcode/td_block_social_counter.php:1102 Stack trace: #0 /web/htdocs/www.rottadeitrasporti.it/home/wp-content/plugins/td-social-counter/shortcode/td_block_social_counter.php(1102): number_format() #1 /web/htdocs/www.rottadeitrasporti.it/home/wp-content/plugins/td-composer/legacy/common/wp_booster/td_global_blocks.php(27): td_block_social_counter->render() #2 /web/htdocs/www.rottadeitrasporti.it/home/wp-includes/shortcodes.php(355): td_global_blocks::proxy_function() #3 [internal function]: do_shortcode_tag() #4 /web/htdocs/www.rottadeitrasporti.it/home/wp-includes/shortcodes.php(227): preg_replace_callback() #5 /web/htdocs/www.rottadeitrasporti.it/home/wp-content/plugins/td-composer/includes/tdc_composer_block.php(278): do_shortcode() #6 /web/htdocs/www.rottadeitrasporti.it/home/wp-content/plugins/td-composer/includes/shortcodes/vc_column.php(316): tdc_composer_block->do_shortcode() #7 /web/htdocs/www.rottadeitrasporti.it/home/wp-content/plugins/td-composer/legacy/common/wp_booster/td_global_blocks.php(27): vc_column->render() #8 /web/htdocs/www.rottadeitrasporti.it/home/wp-includes/shortcodes.php(355): td_global_blocks::proxy_function() #9 [internal function]: do_shortcode_tag() #10 /web/htdocs/www.rottadeitrasporti.it/home/wp-includes/shortcodes.php(227): preg_replace_callback() #11 /web/htdocs/www.rottadeitrasporti.it/home/wp-content/plugins/td-composer/includes/tdc_composer_block.php(278): do_shortcode() #12 /web/htdocs/www.rottadeitrasporti.it/home/wp-content/plugins/td-composer/includes/shortcodes/vc_row.php(1145): tdc_composer_block->do_shortcode() #13 /web/htdocs/www.rottadeitrasporti.it/home/wp-content/plugins/td-composer/legacy/common/wp_booster/td_global_blocks.php(27): vc_row->render() #14 /web/htdocs/www.rottadeitrasporti.it/home/wp-includes/shortcodes.php(355): td_global_blocks::proxy_function() #15 [internal function]: do_shortcode_tag() #16 /web/htdocs/www.rottadeitrasporti.it/home/wp-includes/shortcodes.php(227): preg_replace_callback() #17 /web/htdocs/www.rottadeitrasporti.it/home/wp-content/plugins/td-composer/includes/tdc_composer_block.php(278): do_shortcode() #18 /web/htdocs/www.rottadeitrasporti.it/home/wp-content/plugins/td-composer/includes/shortcodes/tdc_zone.php(591): tdc_composer_block->do_shortcode() #19 /web/htdocs/www.rottadeitrasporti.it/home/wp-content/plugins/td-composer/legacy/common/wp_booster/td_global_blocks.php(27): tdc_zone->render() #20 /web/htdocs/www.rottadeitrasporti.it/home/wp-includes/shortcodes.php(355): td_global_blocks::proxy_function() #21 [internal function]: do_shortcode_tag() #22 /web/htdocs/www.rottadeitrasporti.it/home/wp-includes/shortcodes.php(227): preg_replace_callback() #23 /web/htdocs/www.rottadeitrasporti.it/home/wp-includes/class-wp-hook.php(308): do_shortcode() #24 /web/htdocs/www.rottadeitrasporti.it/home/wp-includes/plugin.php(205): WP_Hook->apply_filters() #25 /web/htdocs/www.rottadeitrasporti.it/home/wp-includes/post-template.php(255): apply_filters() #26 /web/htdocs/www.rottadeitrasporti.it/home/wp-content/plugins/td-composer/legacy/Newspaper/page.php(51): the_content() #27 /web/htdocs/www.rottadeitrasporti.it/home/wp-includes/template-loader.php(106): include(‘…’) #28 /web/htdocs/www.rottadeitrasporti.it/home/wp-blog-header.php(19): require_once(‘…’) #29 /web/htdocs/www.rottadeitrasporti.it/home/index.php(17): require(‘…’) #30 {main} thrown in /web/htdocs/www.rottadeitrasporti.it/home/wp-content/plugins/td-social-counter/shortcode/td_block_social_counter.php on line 1102
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Notice: ob_end_flush(): Failed to send buffer of zlib output compression (1) in /web/htdocs/www.rottadeitrasporti.it/home/wp-includes/functions.php on line 5279

Notice: ob_end_flush(): Failed to send buffer of zlib output compression (1) in /web/htdocs/www.rottadeitrasporti.it/home/wp-includes/functions.php on line 5279

Notice: ob_end_flush(): Failed to send buffer of zlib output compression (1) in /web/htdocs/www.rottadeitrasporti.it/home/wp-content/plugins/iubenda-cookie-law-solution/iubenda_cookie_solution.php on line 722

Hello,
I’ve v. 12.2 and WP 6.1.1
Thank you

Hello Bettina, thank you for your help!
We solved deleting the Mobile plugin