Minecraft player moves weird?

I thought I would download minecraft again, when I wanted to play I realized that when walking the character moves funny, it's like he always goes into sprint mode for a short time. It bothers me abnormally and keeps me from playing properly, just when I run it just breaks off and no I do not hit the sprint button accidentally, can someone help me?

Can it be that your keyboard has a "spam" feature? I have too. Not noticeable in most games. With me activatable / deactivatable with Fn + Q