Upon further investigation into the high x backlash printer @franklin brought over, I noticed the x belt parts had been cracked from over tightening. Not sure how many machines might be like this as it is not obviously broken when fully assembled.
I was looking over the x belt and saw the clamp on the right was cracked at the insert.
I then removed the interface board and saw that the part was split along the layer lines from being over tightened.
The belt tension is at 39.1 with the cracked parts meaning that the belt was tightened way above the 23-45N range prior to cracking