Hello,
Sorry to hear you are having issues. Lot of time these specific files icons, in this case jpg, the file icon is control by the application that set to open this type of files. It could not be changed by Icon Packager. It used to able to change, but, something changed in Windows causing it no longer changeable by Icon Packager.
As an example. In my system, jpg file is set to open with Adobe Firework, so all my jpg files icon will look like Firework icon. While my iconpackager jpg files was set to something else.

Thank you.
Basj,
Stardock Community Assistant.