Why portfolio categories just filters items on the same page?

Hi,

I wonder what the whole point of having a portfolio categories is while it can’t filter items belonging to one category within the whole portfolio!
For example if I have 3 items in category A but the first item in page 1, the second item in page 5 and the other one in page 7, filtering the portfolio in page 1 turns out only 1 item in the that category and it doesnt show 3 items that exist in that category. To find out if there are any other item in that category, a visitor should go forward page by page.
I am sorry but this is not good! when a visitor filters one category, all the items belonging to that category should be shown and not only one item that is in the same page. If the number of categories is more than the number of items that is set to be shown one each page, then the rest should be shown on the next page.

Is there any fix for this?

Regards,
Amir