'Maha, Its Feathers Night' Ward effect doubling+

Playing in the event Trial of the Plains, Black. Opponent using paywall Grix had Maha out. Ward was triggered, I had ample mana to disengage the effect, first click to confirm didn't do anything, another click drained 12 mana. Ward box stayed on screen, I confirmed again, nothing happened, I confirmed a fourth time and an additional 12 mana (totalling 24) drained from my hand.

Please check the card, this isn't the first time Ward has been bugged, so it should be an easy fix. Thanks.