Board Game Arena

Hi,

in a game where I'm playing Sylvan, I summoned the Forest Warden.
But although my opponent has definitely more common and upgraded pieces than me, I cannot destroy one of his common pieces. Destroying an upgraded piece worked fine.

Has anyone else noticed this? Is this a bug?

Note that the count is different than the ones from the flares. For example:
Opponent has 5 heroics and 3 commons. You have 1 heroic and 3 commons. For flare, that's +4 promoted and +4 total pieces. For Forest Warden, opponent has more heroic pieces, but you have the same number of common pieces. So you only destroy an heroic.