Any explanation? The page title and the ad title are so closely matched we figure it can't be that. What would make someone crawl through 3 pages of organic and paid listings before clicking on our ad if what they were looking for was matched in the top organic listing on the first page?
A simple way to check this is to visit the SERP url that people came from, with any luck you will see your adverts in better positions than your average. You should be analysing such data to identify terms of interest (both positive and negative).
9% CTR is not at all unusual for an ad with good positioning, whether that's on the first page or subsequent pages.