I keep moving even though I don't anything?

Hey,

I play on XBox and I've been having the same issue up until just now. It's a controller sesativity issue. Your "stick deadzone" is too low. This make your console/ computer super sensitive to the slightest changes in direction of your joystick/ thumb sticks - even when you aren't touching the controller. This is dew to the inherent margin of error (imperfection) of human engineering/ manufacturing. Play Station, or any other platform for that matter, can't make a controller with perfectly centered thumb sticks, anymore than anyone of us can draw a perfectly straight line.

Here's the fix - access the following menues: Options/ Controls/ Stick Deadzone 

Increase or decrease as necessary.

I find that 11 is the lowest that I can take my stick deadzone before my cross hairs and trooper start moving on their own. 

Hope this helps. It sure was a huge relief for me to to finally resolve this problem. Now I can start having fun with the game, and stop blaming my poor aim on the controller.

Peace bro!