This problem is real, long ago I was updating stuff on AIO updater, and that thing has auto-cheats on, so once you touch on "update cheats" or something like that, all your games will be with all cheats enabled, and that really mess up your saves if you play for a while without noticing it.
IF you played long enough, and never did a save backup, then the save editor is your only fix, but before even bother with fixing the savegame, check if there is any other program with cheats on. Sometimes one program got the database for you, but other is enabling that database. Do a deep clean on the \switch\ folder on your SD card. Remove applications you don't need, then check those big updaters and overlay apps, those usually enable cheats. After that proceed to fixing your save.