I have an ad group that as a whole shows 11.11% conversion rate. When I go through the keywords to see which ones are converting, each keyword shows a 0.00% conversion rate. Is this a Google bug?
Sometimes it can take a little while for the campaign level / keyword level data to sync up. Check it again in an hour or two.
Adwords is not a realtime system. It says at the bottom of the page, that the results might be delayed for 2-3 hours.