Good day. It'll be my pleasure to share some insights with you regarding the bill that has been showing up but has already been marked as paid in QuickBooks Online (QBO).
You may be unable to find a match for that bill if the bill payment from your register is already cleared. Moreover, the date range would also be crucial in matching transactions. That said, you can also check the date of the bill in the bank feed if it coincides with the bill payment. If not, you'll need to edit it so it will be matched with the bill payment so it won't show up again.
You can check out this article as your guide to keeping the record of your expenses accurate in QuickBooks: Enter bills and record bill payments in QuickBooks Online.
Additionally, you can visit the following article for future reference with monitoring your business expenses in QBO:
I'll be around if you need more help with managing bills in QuickBooks. Take care!
