Did you buy an ad? Because I see your comic's icon listed at the top with the paid ads. If not, maybe a fan did, or the system rotated your comic in because there weren't enough paid slots or something.
If I can ask, what kind of numbers are you seeing from it? I've been thinking about paying for a slot but I can't justify spending the money. And if it is mostly bots going through, then it isn't worth it.