Heavy helmet did not register -20 damage

B-Panda

When I was playing against the final stage of the mega latios ex drop event i came across this bug. When the swanna used feathery cyclone on my mega gyrados ex (4 daimond card not 3 star and had stardust flair) with a heavy helmet on i took the full 60 damage instead of the reduced 40 damage it should have been.

DoubleCure

Possibly your "final stage" opponent played the Supporter card "Red" (it adds +20 damage to attacks against opponent's ex Pokemon) during their turn?

*Btw Red is in the "final stage" Mega Latios ex deck.

B-Panda

https://community.pokemon.com/en-us/discussion/comment/118388#Comment_118388

I took screenshot of it but didnt get that in frame, I could have just not been paying attention to be honest. That was probably it though, sorry for false alarm.