Basic attack movement bug with Flay (Barbarian)

On my barbarian, I’m a experiencing an easily reproducible bug. If I left click to attack an enemy (with the Flay basic attack) and then immediately click and hold behind my character to move away, my character becomes stuck on the spot, moving erratically in a clearly glitchy way. At that point, even after I let go of left click, my character is bugging out with strange movements on the spot until I make a fresh left click. It appears to only happen when the click and hold is very close behind my character.