Check out about 9 minutes into my “New Wasteboard” video, I cover out of square spindle: X-Carve Maintenance/Troubleshooting Videos - Add Your Own! - #8 by RobertA_Rieke
I also had to shim my spindle because it was out of square about the X axis. Here’s a picture that shows where I shimmed with business card stock. You may need to shim it at the bottom instead of the top:
