Holding SHIFT makes my character move right, why?

As the title says, holding SHIFT makes my character move right.

I made SHIFT as a sneak button, making you slower when you hold it, but no footstep sounds in the process when moving.

Though, if I hold SHIFT, my character moves right. Removing the event where it makes the player move slower removes the bug, but that's about it. I've tried changing the SHIFT key into CTRL and eventually into H, but it still persists.

.capx link: mediafire.com/file/ugqs2et1016143l/SneakTesting.capx

fixed silent walking, it was cause you where changing the current speed which is influenced by acceleration which caused the locking direction... however if you change the max speed that is another ordeal.

Thanks a lot!