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:Uses NavHeader

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This category can help to identify pages with NavHeader and consequently ought to be part of the current handbook on the wiki.

Pages in category ‘Uses NavHeader’

The following 6 pages are in this category, out of 6 total.

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