[GAMEPLAY] Vayne BOTRK glitch

This happens to me every single time I use Vayne, it makes the character unplayable. I don't see how more people don't have this issue.

After activating BOTRK I get stuck in position, I can not walk, Q, FLASH, nothing. After a short while, about the duration of the active; I can then start walking again. I don't know why it does not happen all the time; but here is some info about how I play that may be making it happen more often.

I play smart casting; but I use the show target display option. Also I usually do R > Q > BOTRK and I am frozen.