When you sprint, there's supposed to be a little animation (wich is not present in this case). I made 2 records of me playing. The one that says "Before" was recorded on the trial version (so not in the beta) and the one that says "Now" was recorded on the beta version. So this bug (like the one with the life bar wich is not centered) only happens on beta (don't know if this happens on the preview version to).