That was my first thought, but I'm pretty sure they're not that off. Before sewing, I've been re-measuring each square and doing any trimming as needed (typically 1/16 of an inch or less). I know I don't have perfect 1/4" seams, but I've been consistent, and measuring a square between two seams yields roughly the same result. My first quilt was a rag quilt and my measurements were much worse and uneven and I don't remember it coming out like this. I can only figure I ironed a seam the wrong way somewhere, but I just can't see where. I must be thinking about it too much and blanking. This is the front, for square size reference:
