Same happened to me here in Meta in the same topic: I clicked on Secure uploads from Announcements via the left menu. My first thought a post was edited, but it wasn’t. Then I saw this topic.
I checked several topics ranging from 40+ to 700+ posts on my own forum and everything is fine there. 
Edit: While perusing my own forum I just now had this happen on an old topic with 47 posts. I was taken to post #28 instead of to the end.