Damage while using Barrage

Issue/Problem/Bug: While using the Buccaneer skill "Barrage" damage is sometimes taken. The skill is supposed to have 100% invincibility.

Describe the problem. Be as specific as possible!:
This can be done easily at Papulatus. Just get on top of the platform with the exit NPC and use Barrage on Pap. You'll most likely be hit and thrown back to the floor. It also happens occasionally at Skeles but I don't know what causes it there.

Quite annoying, yes.

This tends to happen to me near edges.

I'm not a bucc so I'm not 100% sure, but my friend claims even if you are kb'd all 6 hits of barrage still make contact.

^ That's not the problem though. We know that all six hits still make contact, it's the taking damage part that's not supposed to happen.

Bumping up more important bugs that got drowned in the useless Agent event "bugs."

*Has never ever gotten this problem before.*