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)