Fidelity Cash Management accounts will link as both a Bank and an Investment account. This is so you can customize how you want to track this account.
Simply remove the duplicate to resolve this issue:
- Identify the account in question in the 'My Accounts' panel on the left hand side and click the 'Pencil icon' next to the account name
- Click the 'Remove' link in the dialog box.
- Confirm the 'Remove' action
If you have any trouble with this process, please contact support.