I use a 16 images portfolio like you did on the example for my homepage (the first page) with different categories.
But when I click on a category it doesn't load all portfolios in this catergoy up to 16, only the portfolios with the right category within the 16 originally showed latest portfolios.
Lets say I have a total of 8 websites as portfolio entries with the category "WEB" but from this 8 only 3 are shown on the homepage startscreen latest portfolio, when i click there on the category "WEB" only 3 apears even if i had space for at least 16.
I hope i could explain my problem.
Thanks for a quick answer.