Weird Glitch

[cosmicsweety]

Just had a weird game where it says there's one pair left, but if you look at the screenshot you can see there isn't. I clicked hint, and only one tile lit up (the multi-coloured 3 at the top). I know that sometimes you can click on a tile underneath another, but the mouse is not allowing me to highlight one of the under tiles.

[jennwren]

The same thing has happened to me. There is no way to complete the puzzle when that happens