- All available moves create 1x1 hole, but I can't switch my hand.

You may only discard and re-draw if the card cannot be played legally. Otherwise you have to play a card, even if you know that it makes winning the game impossible.

- The top bar says I should discard 3 cards, but I can't select 3 cards in my hand.

You probably played a map in Bandida. You should select 3 cards on the TABLE, not in your hand.