Originally Posted by Zorak

I've seen this multiple times too. It is not possible to show an example, because it is not a permanent property of the link; rather it is a transient bug introduced by something on the forum side.

When I have seen it:
- it affects literally all links in posts on the site
- it usually fixes itself within some relatively short period of time (not within seconds, but usually within a minute or three?)
- the exact same links which exhibited the problem, magically start working again, without the original post being edited

EDIT: e.g. reported back in March: