I didn't see anything when I searched this up, so don't blame me if this is the same as another :/
I had a glitch in MC Win10 edition, when you sprint and stop moving afterwards, you still have sprint particles under you (if you look down).
Also, if you try jumping with it, it jumps you forwards instead of normally jumping you upwards.
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Duplicate of MCPE-9807
I also had this, it appears that the sprint gets stuck on. The only way I can stop sprinting is by running into a block. Crouching doesn't stop sprint.