Sales quote to sales invoice

I have just copied a sales quote to a sales invoice. The invoice has the paid in full stamp on it. Why is this happening? I have done this many time without a problem.
My sales invoices have 30 days payment terms… I have filled everything as normal, but obviously cant send an invoice out with a paid in full stamp on it.
Can somebody please help me.

the customer might have a credit amount.
check the customer balance if there has been any wrong payment entries.
in the Customers tab you can click on the blue figure under the Accounts receivable column against that customer to get a list of their transactions.

This Guide should be helpful: Manager Cloud.

Thanks for the help. Going through the customers history there were a number of receipts that I don’t know about, and don’t know how they were created. All monies on them were in Red. The receipts I send are the invoice with the paid in full stamp. I have deleted the receipts and everything seems to be back to normal. I don’t understand how it happened but it works.
Thanks again

You either created them manually or imported them with a bank statement. If you have deleted them, you may have caused other problems. They were possibly only misallocated to this customer. So you may now have another customer showing as owing you money that was already paid. Double-check carefully.

On this display, red means a receipt that reduces the amount your customer owes.