App Already Installed?

So this morning, like a few of you, I was having trouble with my Facebook app. It crashed upon start. I decided I was going to delete it and reinstall it. So I deleted it on my iPhone, and now when I go back into the App Store to redownload it, the button you push to get it is grayed out and says "Installed". The app has been removed from my iPhone though. I have reset my iPhone twice (hold power and home) and it didn't fix.

Any suggestions?

Thanks in advance