I've seen a couple of other posts concerning this problem, tried one proposed solution, but did not have any luck.
The comment_count field in my wp_posts table is incorrect for some of my posts. As an example, if one person comments, the viewable blog shows "Three Responses" but only the one actual comment.
If I go check the wp_posts table and look at the specific post, the comment_count field shows a 3.
If I change the 3 to a 1 in the table and go back to the viewable site, it shows "One Response" which is correct.