PvZ Heroes Bug

This bug happens in Plant vs Zombies Heroes. This has happened a few times to me. Whenever the opposing Zombie player has a Wormhole Gatekeeper in play, and I play a Cosmic Bean as the Plant hero, the card I conjure from Cosmic Bean’s ability costs the same amount. The Wormhole Gatekeeper is supposed to make the conjured card 1 sun cheaper since its effect applies to both players. Thanks!