Only just noticed this, so if it has always been this way, then I apologise.
Recently I have been hovering over the title of a post to try and get a gist of what it is about, rather than opening the post.
When doing so, I was thinking 'well that is never going to work', however going into the post, the rest of the formula is actually there.
This thread is a good example.
Title is 'Calculated Field Based on Date/Time Fields'
Hover over the title and I see IIF(<=,"1","0") when the formula is actually IIF([CompletedDate]<=[ActualNext],"1","0")
So it seems the site is interpreting the  like the URL links?