LRC Catalog Edits Repeatedly Missing

I have one folder of images that keeps losing the edits.  I'll call it Oct15.  I'd spent hours on edits, and the next time I launched LRC the original images were all there, but not the virtual copies I'd created or the edits.  I restored my catalog using the back up and continued my work.  Then, a couple weeks later I went back into that folder, and the virtual copies and edits were gone again.  I had two additional folders since then with edits, Oct16 and Oct30. 

I had updated LRC since and had updated the catalog.  I had to go back thru 3 catalog back ups before I found the one with the edits.  I updated that catalog and copied the back up to my catalog folder instead of using restore this time, since I had made edits on two additional folders.  So now I've got two catalogs going - one for this one photoshoot Oct15 and one for everything else.  But get this:  My edits on the two subsquent folders Oct 16 & Oct30 are now missing from my current catalog.  And when I logged back in to LRC today, and launch the catalog from the back up, the edits in Oct15 are missing AGAIN.

I'm so worried my catalog is corrupt.  I have it set to run a backup each time I exit LRC, and to test the integrity before backing up and optimize after backing up.  Any ideas?