OK oh gurus of the digiscrap
So I'm running PSE 7, and I've saved my pages in a 12x12 format in both the image size and the canvas size. When I sent it to Sam's Club, or anywhere else for that matter, to print it...they cut off a couple of inches off the sides or top

They said it's because of the canvas size..that it shouldn't be 12x12. They had a nice lady call me and tell me how to do it, and of course I threw away the note I had the info written on. Did I mention I have 4 year old twins???

Please help and tell me how I should be saving these pages for printing.
Thanks so much!!