Overlapping sidebars and page template issues

Hello, We are using Newspaper Theme version 10.4 on our multisite network, with WordPress 5.7.2. Ever since updating to 10.4, we’ve had an issue that affects just two of our sites on the network, one of which is the main site. All the other sites have no issue.

What happens is when we build a page with a sidebar in TD Composer, and leave the page template set to default, we are seeing a strange overlapping sidebar:

This is how we have the sidebar set in TD Composer:

As a temporary workaround we can set the page template to Pagebuilder + latest articles + pagination, but this opens up a whole new set of problems. For example, if we try to change or hide the sidebar in the “Homepage latest articles” settings, no changes occur. Even something such as changing the title on the post loop won’t take affect.

As a result, instead of two overlapping sidebars, we now have two duplicate sidebars stacked on top of each other:

Is there any way to fix these issues? Ideally we would like to leave the page template set to default, with the overlapping sidebars eliminated.

We’ve already tried disabling all our plugins to check for conflicts. Here is some more info from the System Status panel:

Theme name Newspaper
Theme version 10.4
Theme database version 10.4
HTTP channel test wordpress
Installed demo Default – demo ID: default | install type: full
Theme Mobile Newspaper mobile version
php.ini configuration
Server software Apache/2.4.38 (Debian)
PHP Version 7.3.19-1~deb10u1
post_max_size 32M – You cannot upload images, themes and plugins that have a size bigger than this value. To see how you can change this please check our guide here.
max_execution_time 120
max_input_vars 3000
SUHOSIN installed false
PHP extensions
mbstring available
GD library available
WordPress and plugins
WP Home URL https://aptoslife.com
WP Site URL https://aptoslife.com
WP version 5.7.2
WP multisite enabled Yes
WP Language en_US
WP Memory Limit 1 GB/request
WP_DEBUG False
Caching plugin No caching plugin detected – for best performance we recommend using WP Super Cache