Casting bugs with Draven's R, Nami's R, Ezreal's R, and presumably similar abilities as well

I've noticed that sometimes when I was playing Snowdown that I'd somehow cast them behind me. At first i though I had just screwed up somehow, but then I just recently played Draven and I somehow casted my ult in the opposite direction i clicked. After testing this in practice mode, if you accidentally mouse over your champion icon it casts the ability in the direction your facing.

Now this could be a feature but It has done nothing by screw me over. I know this has been posted about before and if it is a bug, why has it not been fixed yet. It costs me big with certain champs