Vertical Ridges

Hi all!
Does anyone know what would cause these vertical ridges in the fill areas?
I have a xTool D1 Pro 20w
I have tried to fix it by looking around on this forum and checking the tightness of the belts. I’m clueless about what to try next.
I am using Lightburn V 1.4.01 on a Windows 10 PC
I’ve attached the picture and the LB file.
I used Borax but not sure if that would cause it?
Logo.lbrn2 (285.0 KB)

pretty hard to see what is going on… any way you can get more light on that and send a better pic ?