Not allowing comments

I posted this one a few days ago, tried about everything, and am getting nowhere. So I’ll ask again. the site in question is http://www.people-in-need.com
the issue is with the “Limericks” page in the Scribes Corner menu.
The idea is that people can rate a limerick, but not comment on it. This page was created to group all the limericks onto the one page, and thus links to an alternate URL which points to the “Limericks” category. Once created, I saved the page as a draft, then went into the Bulk edit and changed comments to “do not allow”. Updated the lot, and published.I’ve done this for a good few other pages, but on the Limericks page it is vital that commenting is disabled. It is the one page where “do not allow” has absolutely no effect, and comments can be left. I’ve deleted the page, rebuilt it, put it under a different menu, it will not disable comments. Has anybody any ideas as to what is going wrong and how to disallow the comments in another way for this page?