If you have the Name configuration variable set and make a reloadable save, it's impossible to play anything other than that save. Since it's a reloadable save, winning, dying, or quitting will not remove the save. It's not possible to delete the save in-game via the load menu, because loading a save automatically loads the save with the default name. The only way to resolve the issue in-game is by clearing the setting, or by renaming the character. Poor behavior and very confusing, as pretty much no one expects setting a default name to do something like this.