I cannot fit my image to a page size

I have a canvas 8000x11412 pixels the image is the same dimensions. When I go to print it doesn’t fit the paper. Which fwiw is A3+.  The printer settings say the correct document size and that output paper is the same. I have an earlier closely identical image which previews and prints fine. I think there is some hidden setting I have inadvertently set.

This is a shot of the image 

When I go to print the preview just shows a small part of the image