I guess what it boils down to, hunterguy,
is what difference does it make? I understand the desire for consistency and appreciate the calming factor in familiarity, but, hey, in the long run, as long as you can view the scans, why should you care? No sarcasm or anything negative intended in the question, just sometimes it's best to accept what you've got and enjoy rather than push for something that doesn't matter in the end.
As others have mentioned before, you can always use an app to unpackage the .rar file into its component .jpg files and repackage as .cbr. I don't know how to do this, but if you read some other comments about .cbr files you should find the instructions and the apps used.
Enjoy.
Peace, Jim (|:{>