Thanks for the clarification, sescarpa. 

The Enter Memorized Transactions reminder won't prompt memorized transactions if these are already deleted. On your end, you still get the same thing.

We can run the verify and rebuild data troubleshooting steps to remove damaged information from the file. I got an article for your that will help you through the detailed steps: Verify and Rebuild Data in QuickBooks Desktop. 

Once done, we can close and re-open QuickBooks to see if the old memorized transaction still shows on the list. 

Let me know how this goes on your end. I'll be around if you need more help.