Controller Issue - Analogue Stick Direction Bias

I'm using one of the snakebyte Final Fantasy XIV controllers, and it's... actually been really rather good so far, before anyone makes comments about fanboyism >.> Ruddy good controller, at least for its price range. Anyway, it's been working fine..

.. Until today. As of patch 1.16a, my character for some reason jerks violently to the left at the end of all forward motion. Having checked the controller's properties (specifically the input test window) in the Windows control panel, I'm fairly certain this is not a hardware issue.

Thoughts anyone?

EDIT:
I have thus far tried rebooting the computer, and installing the controller's newest drivers. Neither has worked.