I was wondering why I had to tap several times on some buttons on my mobile phone to have any reaction. Now I found the reason (see the pic), the right side of button1 “belongs” to the field Text1. Strange.
It’s not a bug or a feature - it’s just how HTML works.
The easy solution is to move the button down in AppStudio’s Project Explorer. That will layer the button above the textbox, so it gets the tap event first.
A more refined solution would be to fix the size of the textbox so it does not overlap the button.