Hi Brenden. Thanks for the usual lightning fast response.
I don't think we are using any sort of lazy load script on the site.
IE9 is like the company's global default browser so naturally internal customers are looking at the site using this archaic browser. This is a battle for another day I think.
So why are some images loading on the page (from the same exact "directory" in the Media Library) and not others? I think I'll wait a little before marking your answer as correct and hope someone else out there has had a similar experience and might have another take on the issue.
Anyone else have any thoughts?