Sorry for the inconvenience.  Known Navigation header breakage.
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:Categories

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This may seem redundant, but this is the collection of category titles, so a category filled with categories.

Pages in category ‘Categories’

This category contains only the following page.

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