Bro you are playing with instant cast, unless you play with quick cast you won't even know if this is actually a bug or not.
It looks like you're hitting the extended edges of geometry.
I actually was thinking about this the other day; unlike dota, deadlock has NO pumpfakeable abilities.
And I really miss them.
How can I cosplay as the Elite Aura Commander: Shadow Fiend, without pumpfaking my abilities?
Probably an underexplored shiv tech, since he can redirect the momentum without wasting dash, but it seems hard to do, and if you fuck up you die, cause you down dash into place.
I don't think that has anything to do with the jungle creep (I'm pretty sure they don't have collision)
It's just the leftover impulse from your airdash interacting and redirecting your down dash velocity.