Can't change robbed cards in case of mistake
This has been said before... If you make a mistake choosing your cards to discard when a robber is played and you have more than 7 cards, there's no way of changing the cards you selected at first.
I think this is a matter of where you are clicking on the card. Try clicking near the top of the card next time and not on the card itself.
It's a weird nuance.
Yeah, I talked about this several times in the past. The buttons are actually on top of each other so when you want to click on the same resource twice, you might add it and remove it on the second click. Probably won't be changed this year.