Nothing is wrong there. I'll give you an example of what it means: Say there are 24 comics on the site, 18 of them story comics and 6 of them strip comics. Your comic comes along as a new story comic, making the total 25 comics overall and 19 comic stories. Very quickly your comic is rated 14th most read overall and 10th most read story comic; that would be because some of the comics already on the list haven't been updated for ages and get no viewers and some haven't even got a single page.
Now apply it to the real situation: There are a few thousand comics on the site. Very quickly you'll move up in the ratings initially because of all the comics that no longer update and those with no pages yet, but soon that will level out depending on how many readers you get.