I think Infinity Ward reset your rank.
Did this solve your problem?
Sorry this didn't help.
Great! Thanks for marking this as the answer.
How satisfied are you with this reply?
Thanks for your feedback, it helps us improve the site.
How satisfied are you with this response?
Thanks for your feedback.
As Dashboard stated, it seems like you may have been reset. Contact IW via their forums
Or contact the IW Enforcers via their twitter