My less than 10 minutes per month of MacOS (none of which is actually doing much with it) tells me it’s because of the tiny buttons on the wrong (/s) side of the window that feel impossible to press and show an up or down button and you never know which is which.
I am sure that this is totally the perfect representation of the average macos user and not just me lol
I did that a few times, it was worst when the character name was just a standard name with one letter difference from the player’s real name. I only found out that I had gotten the two confused after I looked more closely at the sheet a week of talking every day.