Instant fill adrenaline bug?

I dont know if anyone noticed that, but recently i’ve encountered situations in raids where defending characters seems to do instantly fill their adrenaline for no apparent reason. For instance:

-Character is near full adr (say 70/76), i attack other characters to prevent it from rushing but it still rushes next turn.
-Character has 0/76 adr, i do 1 attack on it and it rushes next turn.

*i dont have any “splash” attacks

This seems to happen to me mostly on “bot” characters. How is that possible? anyone experienced that?