How can anyone possibly write 900 original pages overnight?
Are you sure you havn't just added 9oo pages of duplicate content?

But perhaps someone scaped your original content in the first place?
This problem could go both ways...

In any case, you could check both issues here:
www.copyscape.com search for copies of your page on the Web.

regards from Copenhagen,
Mads Dam / www.mads-dam-larsen.dk/english.htm