Weapon swap bugged with crossbow shot. Starts walking and breaks keybinds

So this one I found quite weird and also a bit funny.
I was messing about trying to have a bow on my merc alongside the X-bow, specifically to try out gas arrow skill.

So I added a bow, a gas arrow gem and tried using it while wielding the X-bow, it switched and shot, working all dandy.

Switching back to X-bow though...

I tried using my regular X-bow shoot keybind and the follwing happens:
The skill doesn't shoot at all.
My character starts literally walking (GTA cutscene speed).
The other keybinds for other ammo, grenade skills and even switching weapon doesn't work. The grenade keybinds also drain mana without doing anyting.

However, gas arrow still works as intended and the character runs and acts normally afterwards.
Dodge rolling also "breaks the spell" and everything seemingly returns to normal.

The character model also gets a bad case of scholiosis when this happens..