[UNSOLVED] Why do I continue walking when I am standing still after landing?

I've noticed how if you let go of WASD pricicly after landing then walking animation will still play. I first noticed it with my own custom animations (https://gyazo.com/374c968816b5827c04297d95f484990a) but even in a new baseplate it seems to happen all the same, although quite a bit slower with default animations.(https://gyazo.com/ac33835b5bfc61c0b80fcdd9f76c7c53) I also couldn't replicate the same issue with r15.

My simple question would be; why does this happen and how can I fix it? Much thanks.