Thanks.  Mine is fixed.  QuickBooks decided to add a bunch of duplicates into my company file.  I just had to go back for three years.

why would you need to undo reconcile?

Because your software vomited random records into three years and I had to sit with three years of bank statements and delete them all.  I need to find out how to back my company file up on QBO, as I now know Intuit cannot be trusted to store it without damaging it.