I restricted the max number of portfolio items to be shown to 12. and use pagination.
When a category filter above is selected, it only picks the ones out of 12 only not from all the entries. Is there any tweaks I can make at php files to effect category filter selection to all of the portfolio entries.
This is an old issue with the portfolio sort function. There is no fix yet. If you want to filter all categories on the same page then you need to increase the post number or show all items on a single page without pagination.