CMS Can't Uncheck Sections to Display in Navbar Sub-Menu
 

I click the edit link to a section then uncheck some sections under the Sections to Display in Navbar Sub-Menu. I then click save.

But it does not remove those unchecked sections from that section's navbar sub-menu. If I go back to edit that section, those sections I unchecked show as checked again.

Am I missing something or is this some sort of bug?