One company I work with needs JPGs for printing, been doing this for years without problem.
One JPG however appears correct on screen but prints at 90% scaling. Their printing software has no ability for the user to scale the item, only print 1 up, 2 up, etc.
I went back and checked the JPG on my Mac and a friend's. On both machines the print dialog comes up set at 90% scaling.
I've never seen this behavior before and I never once tried to print the document locally at any size other than 100%.
I was unaware that this type of value could be carried in a JPG file, but it obviously is. Is there a way to strip it out or prevent InDesign from including it?
Not sure what the issue is here, seems strange? Can you provide us with the jpg file for closer inspection?
What was your workflow on this by the way? How are the jpgs being created?