Stop casting not working

[Necroc]

So for whatever reason the only way I'm able to stop casting is by moving. Which doesn't really stop my casting, the spell just doesn't go off. Sitting doesn't work, shift-s hot key doesn't work, Changing the hotkey doesn't work, and the /stopcast isn't working.
All the other hotkeys seem to work fine, as well as any other /command. Was wondering if any of you fine fellows had some insight into fixing this issue?

[Pep]

What happens whr you duck?

alt-o ---> keys ---> movement ---> duck

[Necroc]

Hey totally works! Fantastic, Thanks a ton.