The post is a result of
clicking the Discussion tab link on the wiki page.
It should be taking users
from the wiki page to the existing discussion
relating to the wiki article
There's something odd going on with the wiki/forum interaction,
as clicking that Discussion tab link
is currently generating unique entries.
From clicking the link in the O/P,
takes you to wiki article "Categoryanel".
Guessing someone incorrectly renamed the category
to include an ampersand, (rather than 'and')
i.e. Panel & Gauge Design
which the databse recorded as -
and the database isn't handling that correctly.
The idea of the discussion tab is that you can discuss the content of the article, for example if you want to make changes. But since we already have a forum it is always a bit difficult which discussion goes where.