Highlighted search terms

[Guest Paul Alexander]

This is curiosity more than a 'proper' question - but....

I've just done a search in this forum for the phrase "how many times is a catalog used" and I've got a few result, but I'm wondering what the significance of the 'highlights' in the results are? I've always thought that they were showing where in the results your search terms appear. However there are a lot of strange highlights in this particular list. The yellow highlights below are terms that I HAVE searched for, but the green ones are terms that I HAVEN'T searched for:

 

 

 

So I'm just wondering if the highlights SHOULD actually show my search words, and has something gone wrong?! 

 

thanks