If you're in a tag that has one or more pinned discussions, and you manually refresh the page, pinned discussions are out of order, and aren't at the top as they normally would. You have to go to another tag and come back to get everything back to normal. I don't know if this is normal behavior. I also tried on this site, and the behavior is the same. You can reproduce it yourself, as I did in the Meta tag.
https://imgur.com/vXuXK4x
On my local installation
https://imgur.com/vfzvgYG
Normal behavior:
https://imgur.com/pwxJ1nL
