Your entire site is screwed up. If you click ANYWHERE on any page that is not actually a link, you get taken back to the home page! You have a huge number of scripts installed all over the place and unless someone else has had exactly the same problem I doubt anyone will find the problem.

When designing something, you should test it every time you add some new part. What did you add before this happened? Try removing it and see it that solves it. (You could copy everything to a new folder, and work through removing bits until you find the offending item, then make another copy and just remove that item and see it is cures things totally)

Alternatively, start again, and test it at every stage where you add a script to find the one that triggers the action.

I'm amazed that you could get so far through a project with noticing that a click anywhere in the content does this. Only noticing it on the comments page surprizes me, as it was immediately obvious that everything was active.

Is there some script near the top with an onclick() action that you've not intended to be there?

EDIT
read the next post for the answer! Merry Xmas