Jaycefio

My ender 3 hasn't been printing right an as I found the cause which is the bar the extruder rides on moves a lot so I can never level my bed however I have not a clue on how to keep this bar from moving any help would be greatly appreciated Video reference https://drive.google.com/file/d/1OshFy5HyofHs6wIkWdKCUv-J0YDaNM4T/view?usp=drivesdk