Now I need one of you brilliant guys or gals to help me figure out what I am doing incorrectly here:

I'm designing a postcard for a client so I need to create a front and a back for this particular piece. I create both images (one for front and one for back) on the same layout, in fact I deleted the first document and created the second on the same layout grid. For some reason, when I go to print both documents, the documents, when I hold them up to a light, they are not aligned. I have checked and double checked my printer, nothing wrong there. And I have even re-created the documents all over again but still these images will not line up correctly. In fact, they are off by as much as two millimeters. I got the exact same problem both times that I created this piece. And correct me if I am wrong, but don't they need to line up in order to print correctly at the printers?

Signed,

Confused Mark