Feral Heart

My character has always run in the direction that its head is facing, but recently it stopped doing that and the only way I was able to change the direction they're running is to press the A or D key. I tried logging out and then back in, restarting my computer, and even switching characters, but I can't seem to run in the direction that the head is facing. I probably accidentally pressed the control to toggle this effect, but I have no clue what it is. I need help, otherwise I can't play the game!