Portfolio issues.

Sorry to request help again so soon. I have 3 different pages of portfolio work on my website. I have client work, personal art, and university assignments.

My problem is, that I cannot use the block feature on more than one of these different pages.
If I try to, then the portfolio images from the other pages show up on the new one.

This is very frustrating as I am trying to keep the theme consistent throughout the website. Is there anyway to prevent this from happening so each page has its own set of blocks and items separate from the other two pages?

Thank you in advance.