Cutting depths wrong on wood

Hi I am new to the CNC machine. I am having a problem with my CNC 3018 pro. For some reason it is carving at different depths from one side of wood to the other. My wood is not warped and even though I set my depths the same for the full design it will carve deeper at one side than at the other. I have collaborated my machine so I don’t know what I am getting wrong. Would really appreciate any advice anyone can give.

Your work surface may not be parallell to Z-level.
Search “Skim cut” for what to do :slight_smile: