Maybe it’s my poor eyesight, but the mesh on those gears doesn’t look just right to me. Gear contact looks a little shallow. I’m by far no expert, it just doesn’t look like I think it should.
The thrust surface of an involute gear tooth is pretty far from the tip, so it's not uncommon for the depth at the tip to look uneven. Checking backlash of each separate like @mopowers suggested is a good idea though, because that makes it apples to apples.
