Hello, NaturalMattress.
Thanks for sharing a screenshot.
I'd like to verify some details and give info about the sale. Based on your screenshot it shows that the transaction that is not posted is a deposit. By default, a cash payment from QuickBooks Desktop Point of Sale is placed in the Cash Drawer account in QuickBooks Desktop. While checks, credit card, and debit card transactions are added in the Undeposited Funds account.
If you have set up a custom account mapping between Point of Sale and QuickBooks Desktop, you may need to use the Transfer From and Transfer To instead of the Cash in Drawer or Undeposited Funds. The step by step instructions are included in this article: Handle bank deposits in QuickBooks Desktop after a Financial Exchange.
To learn more about the QuickBooks Point of Sale, please check out this link: QuickBooks Point of Sale (POS) FAQ.
If you have any additional questions regarding the process or need help with other concerns, please add the details in your reply and I'll get back to you as soon as possible.