Pagination is showing duplicates

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Job Description

I have a custom pligg install.

I have duplicate stories on pages.

Ex: I have 15 stories per page.
On page 2, there will be 1-2 of the same stories repeated from page 1
On page 3, there will be 1-2 of the same stories repeated from page 2

I need to fix this bug and make sure the stories aren't duplicated on new pages.