Reconciled Ledger Entries Appearing in Reconcile Window

On October 10, I posted the following:

Windows 11 OS up-to-date; Quicken Classic Premier version R58.14 Build 27.158.14

When reconciling my Citicard, I suddenly see 12 transactions from last April that appear in my Reconcile window sometime lasts month. Because I'm human, I assumed I had somehow duplicated these and would fix them when I found the time. Here we are a month later, I finally started looking into the situation. These are not duplicates. I opened my Citi account on line and double-checked the statements, and yes, each of these cleared late April, early May. If I click on these in the Reconcile window, the window shows a difference between cleared and ending balances. If I manually mark them with an R, then run the reconcile process, I get the same difference between cleared and ending. I'm at a loss how this could have happened. Is there a way to re-mark these as cleared/reconciled without having to enter a dummy transaction to make up the difference?

I have run the file validation tool. No read errors. All security references are within the normal range.

Oh, and I have backup set to every three sessions, with the date as a part of the file name. I have plenty of backups, so that I could go restore a file from July, but wow…that would be a lot of un-entered and uncleared transactions I would need to re-enter!

I'm stumped.

I failed to mark my post in such a way as to get a notification if someone responded. Someone did, asking questions, but I didn't know, and the question got closed.

Here we are two weeks later, and it's happened again. Now my version of Quicken is R59.18 Build 27.1.59.18.

I have three more transactions that cleared around September 27, and they are still marked as reconciled in Quicken. But, when reconciling this account, these three appear in the "reconcile" window as if they were never reconciled. When these three appeared in the Reconcile window on the day the three transactions were downloaded, everything appeared to work fine. For the next few weeks, these transactions did not appear in the Reconcile window. Two days ago, they showed up again…but are still marked with an "R" in the ledger. If I mark these as reconciled again, it throws my balance off and Quicken wants to enter a balance adjustment. And I can't delete them, as they are already marked as reconciled.

This is a Citicard credit card account. Is there some way this has something to do with the hiccups that were occuring with downloading Citicard transactions? If so, how do I go about fixing this?