Difficult to describe the bug and I did not find a matching head line in this forum - so may be that one is new:
During my turn when I cycled a card I touched several times rapidly my screen (to fasten the ever boring animations).
Too late I recognized that the game just now paused - but somehow it seemed to have stored my actions.
Because after the pause it executed all action - popping up cards details - and of course enlarging the art picture.
After the animations frenzy the details of a card (Curator of mysteries) was shown.
Now this window was following my finger on the screen - I nearly did not get rid of it anymore.
I could touch the screen where I wanted - the card details window just moved along. Art zoom was still working - and luckily the button at the bottom.
The only thing which helped was several times hitting abort and cancel afterwards.
After the third time the card details window was gone.
But now I could not play or cycle cards anymore - but I could move gems.
After that the game worked correctly again.
//Removed Inappropriate Content -Brigby