OK, I finally got back to this anomaly and it has not self-healed. I pulled a My Finds Pocket Query and used the full listing of finds script to generate PGC's view of my finds. A judicious cut, sort and diff allowed me to see which find is missing in PGC. It seems to be GC1JBXH. I can see nothing remarkable about this find nor have I mucked with the log that I know of. Geocaching.com has it and PGC does not.