Trouble with X Axis

:sob:Hi, i ordered my Falcon 10w on July

I have been having problems lately with the x axis.
I use Lightburn, each time i try to cut, the x size changes

For example, if i draw a rectangle 200mm x 10mm, the X side ends up being 210mm


I go to lightburn > Machine settings > Calibrate Axis > X Axis

Draw again and… still wrong


I repeat the same process over and over, first draw a rectangle or square then change the X axis on Lightburn then draw a rectangle, then change again on lightburn and again and sometimes it ends up being the right size, BUT the next shape that i try to draw is wrong size again

This has been happening for a long time, i tried to tighten and untighten the belts many times, sometimes looser, sometimes tighter

I don’t know what else to do !