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Cloud saving in general can cause all kinds of weird things - by premise, it will check whether the save files are in sync when the game opens and will upload them when the game closes, but changing files both with the game closed or while the game is open is undefined behaviour - e.g. Steam might straight up cache small files in the memory for quick access.

As for my doubts of name having anything to do with this (unless it’s on Steam’s end), the character name has no meaning - in fact, your character name can even be different from the file name, which will happen if it contains characters that are not allowed in a file name (like \/<>|"*: on Windows)

If your character with a name made of numbers can be edited, but mine cannot, then this is caused by something else, more strange. I don't know what exactly, but not only in numbers, I guess. Interesting. I will try to conduct tests, and identify the real reason, and then inform you. Good luck.