Mobile theme is showing up in desktop mode

Hi,
This problem is usually from the cache plugins that doesn’t recognize that there are two themes, one for desktop and one for mobile version (mobile theme plugin).
If you are using the mobile theme plugin, please make sure that you are using a cache that can different the mobile version from desktop version, a tested cache plugin is WP Super cache, here is a guide with the settings that need to be made for this plugin -> https://forum.tagdiv.com/cache-plugin-install-and-configure/
Hope this will help you!
Thank you!