Why is IntenseDebate is only showing up on the index page of my Tumblr blog?The reason may be as follows.
a div with the id “posts” as part of the default install. Could you please add the following to your template wherever the comments should be? That will take care of it.
You’ll also need to put in a div with the class “post” in each tumblr post.
Like the following:
This is how IntenseDebate determines how many posts are on the page (>1 it show links, <=1 it show the comment section).
Sources and Citations:IntenseDebate FAQ