With the new update, I played the scheme that puts the purple circle over each spot and adds +1 to the attack. The Mastermind correctly showed the updated attack value until I attacked her. Then she went back to showing her original value.
The second bug I don't know if it was fixed in the update. But there was a card that said you could KO up to 4 cards. However, there was no way to only KO 3 heroes. Since it says up to, I should be able to KO 0-4 heroes of my choice.