Card Scramble - 'Undo' button creates bug

On levels where there are squares covered by a suit (i.e.♥️) - where you have to place a card of a matching suit in an adjacent square in order to remove; like level 4-21, if you UNDO a move that cleared the SUIT-COVERED squares, a bug is created that prevents the SUIT-COVERED squares from being removed. 

For example, I had previous cleared the column of hearts ♥️ with a move but then purchased an "undo" ↩️ which put the column of hearts back. Even after playing another 2 hands that both had hearts in adjacent cells (see below), you can see the hearts do not go away.

Not only does this make future planned moves impossible which will most likely causing the player to lose but it also wastes the 150 coins💰 it took to purchase the UNDO. Please fix this. 

FWIW - this bug happens on every level that has the suit-covered squares, as I've run into this repeatedly.