thanks to reply!
well, I have users that visiting my forum from different countries with different languages, so I need to enable different language packs on the forum. So I will have users who have to use RTL mode.
The problem is that when a user wants to register on an Android mobile phone with a Firefox browser, the registration form (popups) opens abnormally And the user can't see the form completely and has to scroll(X-Y) the page in different directions. (fist video).
But in the Chrome browser, the problem is different, the registration form opens correctly, but users cannot scroll(Y) the page and fill the form. (second video)
I hope I’m getting my point over