I don't know if it's a bug or it's just now that I'm playing SMN more or whatever, but I've noticed that a lot of times when I use an aetherflow stack, it doesn't count towards aethertrail stack.

I just finished a hunt of the A dino in forelands. My dots were up and I used fester three times and none of those times counted towards the aethertrail stack. Can fester miss or does it not always give you a stack of aethertrail? It's kind of confusing.