Character keeps walking after releasing the key (Close)

[winterschwert]

I'm not completely sure if this is a game bug or my system. This is what happens every time: When I press the keys "S" or "A" to walk downward or left for longer than 2-3 seconds, the character will keep running for a couple of seconds after I released the key. For example, I push "A" for 3 seconds and I run left for 10 seconds. It does not happen to me when I walk upward or right.

* It does not happen in other games
* If I change the key assignment, the walking lag remains on the original keys S+A
* Changing the keyboard does not fix it

Edit: Found out the problem. It was a tool on my system which used these keys to insert special characters after pressing for a while. After disabling the tool, the walking works fine.