Image Pairing has a bug in the handling on mobile devices. I noticed it on the iPhone, I couldn't test it on Android.
Testet on iPhone X with iOS 13.5. in Safari
If the list of items is longer than fits on the screen the game is sometimes not solvable. The problem is, if you move a card, the content does not scroll when you reach the top or bottom of the screen to see the rest of the content.