WPTouch causes a javascript error in the latest version of WP. In most browsers you can right-click any space on the page and then click Inspect. Then click Console. You will see the error, caused by using jQuery.live(), a legacy function in jquery.
WP has an official plugin to fix this issue:
“Enable jQuery Migrate Helper”
https://ww.wp.xz.cn/plugins/enable-jquery-migrate-helper/
See also: https://wptavern.com/major-jquery-changes-on-the-way-for-wordpress-5-5-and-beyond
When a plugin like WPTouch triggers a js error, any “live” elements on the page stop working. In this case it affects a WPTouch feature, but it can also stop other features, like those from other plugins or WP itself.
Also, WPTouch has still not fixed my pet peeve, its use of a deprecated Jetpack hook that fills up my error_log with notices. But that’s not js, so it does not stop the page.
