Saved Search With Function Rank is Being Ranked Per Page of the Search Result

1. In order to resolve this, navigate to Home>Set Preferences>Click on General tab>On Number of Rows in List Segments - set the number (e.g. 500) 

2. Click Save

Per Field Level Help:

When you look at a long list in NetSuite, the list is divided into segments. Enter the maximum number of records you want in each segment.

For example, if you have 200 customers and you would like to see them in groups of 25 per page, then set the segment size to 25. To see the next set of 25, select the next group from the dropdown list at the bottom of the page.

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