In PS 19.1.9, I copy and paste a layer in a digital collage (which has been printed out), then duplicate to a new document, and crop, and print. When I try to physically paste the new layer over the original I find that the new doc has distorted enough so that it does not fit precisely over the first one. It's as if the copied layer has been stretched just a little in both axes. This doesn't happen every time, but has been going on for years. Any ideas what's going on? I work on a 2012 Mac Mini with 10.13.6. Thanks!