It's a part of the player model. That's my theory. I've experienced this too without too much of a hassle. I only experience it when I'm trying to run and gun with my machine gun. Every other weapon is fine. It's just a minor thing, unless Capcom fixes it, I'll just stick with it. 
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I figured out that it's part of the control scheme. I think I'm using Pattern C. On the button layout screen, it says that if you "tap" the stick left or right, you do a 90 degree turn in that direction. The problem is, it never works when you do tap it and it works randomly when you don't want it to. Either way, I think it's a poor choice to include that function. But yeah, it's not that big of a deal so it's not too bad.
How ya doing, buddy?