Good day, AmandaCarriveau,
Let me get the help you need about your Square transactions.
In your case, since only one transaction was not imported, I'd suggest creating it manually to eliminate possible duplicate transactions.
You can either enter transactions directly via the Bank Register or enter it with a specific transaction form.
Here's a great resource that you can check on for more detailed steps: Add transactions to bank register.
You are always welcome to come back in if you have further questions concerning Square transactions, I'd be glad to help. Have a great day!