I'm having an issue cutting with my miter saw. I'm trying to cut angles, but then they don't match up. I thought my blade was flexing, but doesn't matter what brand of blade, or how expensive it is. I've started a little side business making custom benches and this is driving me crazy. The only cut that is dead on is a straight cut. Could the markings on my saw be off??? Is there something I'm doing wrong?? Any help or insight would be greatly appreciated!!!