Unsure of exactly what is causing these issues. But for whatever reason it seems that when I go through the process of baking in the dirty vertex colors my original texture goes a bit crazy and I'm not sure why. Any sort of advice would be appreciated.
here is a link to the file if you want to take a look: https://drive.google.com/file/d/174dHZe8uhaAlj-OZ-otQmPSy4K0fLgrI/view?usp=sharing
I don't know what happened, but for some reason your UV's are all messed up:
When re-unwrapping, everything seems to be ok, but that would mean that you have to do the painting and DVC baking all over again...
I think that's a good idea, you'll be surprised at how much faster it goes the second time and how much better the result...