You don’t move the sales invoice itself. You must move the line items within it by allocating to an income account. Your explanation is hazy, but you say you “marked them as paid.” You don’t mark a sales invoice as paid. It changes to a Paid in Full status when you have received adequate funds into the Accounts receivable account and the Customer’s subaccount. See the Guide:
https://forum.manager.io/t/receiving-money/7820
If that doesn’t fix things, have a look here:
https://forum.manager.io/t/troubleshooting-the-suspense-account/7106