Reporting a Glitch - Quinn vaults vs scuttle bug

I have been playing alot of quinn lately, and it had come to my attention that when i vault, (e) onto the scuttle bug (river creeep) an unknown and unforeseeable error occurs. i get stunned, (purple halo) for about 5 secs, enough for harrier to run out, and instead of vaulting off, i am directley behind the bug, just stunned. Has anyone else seen this. i think it might have to do with the angle at whichi wault, but have had this happen well over 50 times. What is the deal?