Thanks for the comment. Could you specify in what situation it got stuck? After lottery draw or when filling the ticket? With Claim or Discard button? Please let me know.
I'm not sure, I was doing a loop of buying bunch of tickets and opening them back to back (this was before the scanner). At some point one of them didn't leave the screen, it doesn't have a discard or claim button, and it also blocks the next ticket's discard or claim button partially (need to find the proper spot to click instead of the whole button working). I played some more and I'm not sure if it was because I was using the scanner or that I was spamming the 3rd game forward, but it didn't happen anymore after that point.
So maybe something with the slower drawing process with back to back tickets?