OK, I have R-3000. Attached via wireless to my iMac Pro 8core etc. When printing to 13X19 paper everything looks good, but when printed its out of position.. I knowthis is not an Epson forum, but i'm not sure where the problem lies. Also if I make some sort of forum faux pas please forgive me..
Is this a repeatable problem on other sizes? Did it just start happeinging? If so you may need to have the print heads aligned by Epson. Have you called Epson support? I have had good results when calling for service. It seems like you'll need to go through some troubleshooting with them.