Institution key shows wrong college after using collegeFilter

[keeeeenw]

Steps to reproduce the issue:
Go to any person's visualization page,
Open collegeFilter,
Select "American Academy of Religion" as the only institution,
Click "Save and Close"

All the children of the root are positioned in the center of the graph.
On both person and interest visualizations, the institution key on the bottom is
displayed as "University of Virginia College of Wise".

This issue would go away if we chose more than one institutions.