Sorry for the inconvenience.  Known Navigation header breakage, its being "rebuilt."
There may be other unforeseen breakage primarily in the handbook portion of the wiki.
The Table Of Contents section of each "PC-BSD® Users Handbook" page may be the best workaround.

Category:Navigation

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These pages/templates relate to ways to more easily traverse the handbook.

Personal tools
Namespaces

Variants
Actions
Navigation
Toolbox