Rob,
I'm just talking about the pixel dimensions of the resulting file. The "Resolution" metadata in the exported file is a meaningless number.
Pixels per inch
Pixels per cm
Only thing changed is pixel per inch to pixels to cm. The file pixel dimensions are 2.54 times and big. THIS IS NOT A BUG but is the way it is supposed to work. I never use this method of export and instead just use the pixel dimensions I want for the long side if not printing or export FULL size if sending to the print shop.