When you have a FUSE content visualization that's displaying search results, the sort order is determined by the ranking score assigned based on the keyword(s) passed to the search resultset.

FUSE shows the results in descending score order.

What happens, however, if you're using FUSE to visualize content outside of a search situation?

In scenarios like this, when no keywords are passed, most results have the same score so FUSE doesn't know what order to show results in. 

Think of this scenario: what would happen if you did a blank Google search? What should show first in the results?
For customers that desire a uniform sort without keywords applied, FUSE can add a secondary sort, usually using the content item's ID. As a result, FUSE first sorts by score descending then by ID ascending.
This forces the results to display in the same order each time.

If you haven't already, you'll want to work with FUSE to weigh certain results so we can ensure what's most important shows first in these scenarios.  For example: ...videos should be weighed 3x and podcasts 2x over other items; mike_wilcomb_presentation.pdf should show on Page 1 always; most recent 'last edited date' should be favored...

Without keywords being passed, the ranking order in which content items get returned is random.