Wasteboard screw holes

Just curious, but I recently made some blocks for the bottom and sides on the wasteboard as well as a corner block to help square the material I use and I’ve noticed that the tie-down holes are not square with the grid pattern, has anyone else ran in to this problem as well? I’m thinking that the grid pattern didn’t get lined of properly on my wasteboard during production.

What matters is that whatever you use to align anything is square to you machine’s travel.