i can get that a mapped domain store displays a selected product in the global cart in the main mark

i have a wp multisite with marketpress, domain mapping and some other plugins, im testing stage but when i started to add test products ive noticed that the one store that has his own domain (other stores created are on subdomains) didnt show the product that i add on the basket on the global cart....i enter the top domain store, add a product to the basket, and it apears on the particular store cart but not in the global cart on the admin site, that dosent happend with the subdomain stores...can any one help with this?

its important to me that all products from all stores (domain or subdomain) appear in the main site

i do have my global cart turn on