Experiencing touch offset issues replying on Android

From our users (between 200 and 300 engaged users ) :
Since one update committed after the 25th of april (I don’t really know which) to the last update ( v2.1.0.beta1 +200) the bug didn’t happen. But since this last version update we have a lot of reports describing exactly the same behaviour.
Reply button doesn’t fire (as if something transparent was above). Once it happens, they said they need to relaunch the app (for the app users) or close tab and reopen a new one for browser users.
This was reported only on android with differents devices brands (Samsung, One+x,…)
Ha I forgot.

  • This NEVER happened to Admin or Moderators users. happend to admin (06-17)

  • We DID NOT tweak or customize the mobile ui with some extra CSS or JS.

  • Neither the cancel button (with the trashbin icon) or the upload button are triggerable.

  • Here is the list of our extensions :

  • The discourse ad plugin is activated for every users this can not cause the bug to be invisible for admins…

Not beeing able to reply on a forum is a huge issue, I really hope you will find a fix. Let me know if you need some extra informations or if I can help in some way.