Something's Wrong With My Tape Measure

I began to hang the upper cabinet doors yesterday. All was going just fine until this........ I had taken measurements of all the openings. The door or doors, if there were going to be two, needed to be one inch larger, both width and length. Guess what? Oh well, there's no choice but to make them over. I can salvage the vertical stiles, so it's not a total loss. Once they're all up and dialed in, I'll take them down for sanding and finish. Again, these will be getting frosted glass panels to match the pantry door