I think I may have figured out what happened. We did a re-import of some users to correct a couple of fields (but we only re-imported those fields we needed and user name of course using cbjuice). It seemed to have changed ANY dates that are within that profile (even though those fields weren't part of our re-import).
Look at this history. Old value vs. New value on the day we did the re-import. It's strange.
Why would it default everything to 0's??