It's probably more common than some would think, if you started to actually go around checking everyone's bikes. I had a Pinarello years ago and after having it for some time, once realized one of the "P" letters was noticeably crooked. Even worse, I bought Miele decals from that guy on eBay that got all the originals when they closed. Beautiful decal set and I was super careful applying them. Then realized the seattube "MIELE" letters were uneven. I couldn't figure out why and went back to the peel away sheet that came on top of the decals, and realized that the "crosshairs" printed on the sheet to help you line them up, were themselves misprinted.