Hello @mick0,
Thank you for reaching out to the Quicken Community, though I do apologize that you are experiencing this issue.
To clarify, you are experiencing and incorrect balance with Fidelity in your main file and so you created a test file and the balance was correct there?
If so, I suggest deactivating all Fidelity account(s), removing the saved login credentials from the Keychain Access app, and then reactivating the accounts. However, before doing so, I do recommend saving a backup of your data file first (just in case). Then, please check and make sure you do not have any hidden accounts that may be connected to this financial institution.
After that, please follow the troubleshooting instructions below.
Let us know how it goes!