E Shift-3 (bindings)

[turtledwarf]

hey, on my mage I have Shift-3 bound to Fire Blast which is an instant cast, but whenever I try to cast it while strafing to the right (E) it won't. I tried with other spells, both instant ones and channeling ones, the channeling ones won't even say "you can't move while doing that". But when I try to strafe to the left (Q) it works completely! Has anyone had a similar issue?

Shift-E isn't bound to anything btw