I submitted a tickey through this site and the app store to the email. Eventually the target score dropped significantly to under 300,000. I'm not sure exactly what fixed it. I hope you can get it resolved.
I see that many people are able to accumulate points that quickly. No matter how many bombs I clear, boosters I use or cascades occur in my version the points due not add up that quickly. I have seen other people posting with similar concerns.