Stunning entrance bug II

I was runnings Scaremuga(The skeleton Legendary) and I soul snatched my opponent’s stunning entrance monster.When it entered the field my opponent wasn’t stunned .I thought it happened bcz of soul snatch .But next time it happened with my stunning entrance Mon.Then I noticed each time it happened Onyxia (2nd form) was in the battlefield.I lost a match bcz of this problem.Also there was no Aetatharion (stun immunity field) or whatever wasn’t in any of our team.It happened to my hero rank 47 acc.

Here’s my team’s picture.It happen with that Holy element SE.