Problem changing Gridmarket, FrameMarket Header logo for multisites.

I have a problem changing the header logo on my website. I was able to easily upload and change it on the main site. http://www.renfestmerchantmall.com. However on any of the sub-sites http://www.renfestmerchantmall.com/Merchant1, I can go through the motions in either theme customize, Theme Options or Header and it says that the header is changed, but doesnt do it. I have disabled all plugins and cleared the cache, still doesnt work. I want each sub-site to have the ability to upload their own header 980px X 100px.

Thanks for the help.