Why does a transfer between a line of credit and checking account show up twice in my checking account? How do I reconcile these when the same item shows up twice?

Hi, lauren-fedenia-a.

If you're using Banking, make sure to Match the transactions instead of Add. 

To resolve this, you will have to undo , match and review back the reconciliation process. For additional information, please refer to these articles: How to add and match downloaded banking transactions.

Also, make sure that the set-up in recording the line of credit transactions are entered correctly. Here's an article that provides further details: Set up and track a line of credit in QuickBooks Online. It includes topics about transferring credit funds, interest charges, and making payment to your LOC, to name a few.

For future reference with reconciling your account, I can see this article to be essential in this task: Learn the reconcile workflow in QuickBooks.

I'll be here ready to help if you need anything else with QuickBooks. Keep safe.