Originally Posted by
Stitchnripper
I noticed that when I cut on one of those common white folding tables, that I had the bowing - turns out they aren't that stable for cutting, at least mine aren't. I put a thick solid board (which was a cabinet piece from the IKEA as is section, so cheap) under the mat and my blades last longer and I get better cuts.
My first thought was the surface the mat is on, must be firm like you did using solid wood.