Currently running a Corsair K100 keyboard and had it set to 8000hz polling I am also using a Razer Viper 8k also set to 8000hz polling.
Both the mouse and keyboard are set to 8000hz polling when in game the keyboard will act if the players movement is entered 4 times and continues moving after no buttons are pressed.
I switched to my game pad and the issue was gone, switched back and the issue persists.
I am in the middle of testing 4000hz, then 2000hz, then 1000hz on the keyboard to see if the issue is resolved if not i will add a secondary response to this main post