Are you using Quicken Mobile?That is about the only way I can think of where two data files can get "cross linked".
Thanks! I will check that out and post the result. I'm curious though, because having my files in the Cloud - though worrisome - would be very convenient for me. Is the cloud version just a backup, or can they be updated as well?
Even though you aren't using the Mobile app, I would make sure you aren't syncing the the Quicken cloud. Edit -> Preference -> Quicken ID, Mobile & Alerts, you should see a Get Started button. If not you are syncing to the Quicken cloud.You can also look at Edit -> Preferences -> Cloud Accounts, and you should see Last Sync: Never