@Anonymous: Unfortunately I could no find a solution to this problem. My accountant tried to help, removing Company Name for all vendors, leaving Vendor Display Name and Name To Print on Checks, and that didn't make the duplicate line disappear. The only thing left to do is to open each payment and physically erase the vendor name from the address line? Which is impossible, I do not have time to do this every week.

As JamaicaA mentioned they closed my ticket. Does it mean the tech team stopped working on this problem? Nobody followed up on the issue with me.