Cut Drifting

I just finished building my CNC last weekend, I was lucky enough to stumble upon Easel. I’m liking the ease of use of the program but I’m having an issue. When the machine makes multiple passes, the bit drifts to one side.


Both of these cutouts were made from the same file, I just rotated it 90deg and redid the cut. nothing else was changed. I’m not thinking its an issue with my machine since the cut goes towards the same side of the image no matter how it’s rotated. Has anyone else had this issue? Any ideas on fixing it?