I have seen two unrelated instances of a single random line showing up on my invoice when generating one using the path

sales order, main, invoice data entry

 the GL detail report that I printed early May for our April rebill, as well as the latest printed GL detail report from today showing the duplicate $62 line item. 

BUT the invoice, accounts payable invoice registrar and daily transaction registrar from 5/11 when I did the April rebill only show the $62 line once. 

My erp also shows the line twice now. 

The instance has been on batches that I print, look over and approve and close all at once so there is no chance that I am accidentally somehow duplicating the line after i print the invoice and reports.