Global products not adding to categoreis


i am trying out the multisite with global product list.

1. i add a product in my multisite in categorie "camping"
2. The product shows up on my main site on home page.
3. Product is not showing on the mainsite in categorie "camping"

any ideas why? and also the multisties have the same categoreis as the mainsite (gridmarket) is all cloned with "New Blog Templates"