Continuing the discussion from [POLL] Question to users about how you read this forum:
If you are in Latest you can’t actually unpin the “Welcome New Users! Read for Rules, Help, Bugs and where we put the Game Servers” post by clicking on the pin — it just takes you to the post.
Is this just a bug, or a non-public administrative ‘feature’?
(I can unpin the “General Forum Guidelines” post above it, which makes this behaviour a bit weird.)
Going to discuss this with mods. It may be a bug with two line posts where the unpin button doesn’t trigger correctly.
If you go to the post itself, you should be able to unpin it there for yourself:
Ok I have just checked and it’s a CSS bug in discourse itself potentially.
The padding covers up the pin button.
I have found a fix that will be implemented in due course.
Thanks for reporting 
You may be the first person to click on the rules
I’m glad it was an actual bug. 
Thanks for confirming it and coming up with an eradication plan!
It’s a dirty job, but someone’s gotta do it.
