The add-on may block something else (e.g. a script from a 3rd party server) that's needed to display the page. Or it may just misbehave. It's not the first time in my experience that you have to disable an add-on completely to fix a problem.
You don't need to do anything. I could close it, but that doesn't make much of a difference since it's re-opened automatically as soon as somebody posts a new comment anyway. This is more like a discussion forum than a ticket system.