Every one of my pictures is coming out with half the picture.

Every one of my pictures that I've taken with my new Instax mini 7s is coming out with half the picture. It looks like a thumbprint . I went out and bought new ones and was very cautious with them and to put them in , and Also they look the same. I've re read the directions and everything and can't seem to find anything on here that explains what's going on .