I modified the behaviour so that tap and hold will straighten the card and magnify it. When you release it just goes back to the original position. Short tap plays the card.
Can you refresh the browser and see if it's fixed? I also made the hints slightly transparent as a quick temp fix, that needs a bit more time and testing
I changed the behavior now: tap and hold magnifies it and short tap select the card. At least with my fingers now I was able to avoid the mentioned side effects
I fixed the first issue: I got also an alert at the same time that I ran out of quota on the db so had to increase it. You should see your point now. The duplicate cards issue is strange.. I'll have to debug that a bit more