“Fit” to page print option not working with custom size?

We recently had Adobe Acrobat reinstalled but we are now having an issue with printing custom sizes and the "fit to page" option not working correctly. When selected, rather than fitting to the specified size, it will zoom in really close on the corner of the document, or add a bunch of white to the top of the document so only the top of the file is within the print area? 

I've spent hours trying out how to fix this but no luck so far! If tried 'print as image' and checked the default settings of the printer to make sure it's not scaling.