Bug on brainy zombie heroes all cards conjured cost 1 less (PVZ HEROES)

Hi I’ve noticed a bug mainly with brainy zombie heroes. Whenever they conjure a card it always cost 1 less for some reason. I keep running into scenarios where the opposing players have conjured cards that cost 1 less for no reason. They wont have a dr spacetime or wormhole gate keeper or any other cards that makes conjured cost 1 less. Its literally for every card they conjure and its making it extremely frustrating to play against. Please fix this bug EA I like this game, I don’t want to quit but I will if this bug isn't resolved.