Paid Search channel shows no data

I have my paid search detection rule set up based on the query string parameter and based on that i have my marketing channel rules settings. The marketing rule also defines rules for other channels such as direct, internal, email, etc. When i am pulling marketing  channels overview report,  all visitors are bucketed under direct and internal. Paid search does not shows up though i see tracking codes getting captured for the paid search. Any idea what might be wrong?