Eu am pati-o la fel (pagini cu noindex apareau in G index), si gasisem explicatia asta : What should NOINDEX do?

Ma refer la partea cu : "Our highest duty has to be to our users, not to an individual webmaster. When a user does a navigational query and we don’t return the right link because of a NOINDEX tag, it hurts the user experience (plus it looks like a Google issue). If a webmaster really wants to be out of Google without even a single trace, they can use Google’s url removal tool".

Acum daca tu zici ca pana acum directiva era respecta si doar de curand ai observat efectul asta nu stiu ce sa mai zic, eu am observat asta prin 2010.