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Cache files, maybe? But only if the old copy is causing problems ingame but the files appear fine out of game.
Most likely you're working on an old copy of the file for some reason or another. That's the most likely culprit, as meshes don't usually revert to an old copy all on their own.
Personally I tend to rename files with version numbers until I'm done with them, because that tends to take care of the "am I working on a new or old copy of this file?" question, and also makes it a bit easier to identify old copies if they've decided to hang out in a random Downloads subfolder or SavedSims, which happens from time to time (I suggest a TEST folder, with nice big capital letters for projects you're currently tinkering with and testing out, and not letting anything hang out in for instance SavedSims - could be there's a copy of the old file there).