During matches my character will just start moving in one direction as if my movement keys are “stuck”. While tabbing out and back in will temporarily resolve it, the issue always comes back. I’ve tested my keyboard in other games & so far Overwatch is the only one that this happens in.
Do you have high precision mouse input enabled?
I have experienced the same issue. I do not have high precision mouse input enabled.
Enable it, that should fix your issue.
This is known by the team.
Here is the main thread: Main Thread - Movement keys sticking since last patch