My opponent played Brann into Topior into Zola and 1 nature spell which summoned x4 whelps. For the remainder of the game, each nature spell summoned 4 whelps even though they never played either Topior that was copied in their hand. They should have only summoned x2 Whelps per spell.
When I tested that interaction with just Brann Topior, it only summoned x2 whelps like intended.