Photoshop can only print one image on one page (unless, of course, you tell it to print multiple copies). So this sounds a lot like a problem with the printer driver (and very similar to some bugs we've seen in other Epson drivers).
What OS version are you using?
Have you updated your printer driver from Epson's website?
Windows 7 Explorer 11. I have updated printer software and I still have same problem. If I use another program it prints perfect just in PE 13 it has a problem. It prints 1 partial with 2-5 blanks and one good one.