532 impressions but 11 clicks is that a lot, because I have never had some many click with that little impressions
I myself have over 3K impressions per day and I hardly get any clicks. The way I think of it is that the user may have just visited and then left the site which gave an impression, but with your site, those users did not leave straight away, perhaps because you have good content..
So you're user's must have clicked the ads straight when they went to your site and did not do much 'browsing' around your website.
On my site if there is 1k impressions must have 10-15 clicks per day 30-40 k impressions 300-350 clicks per month
Take a look at the Google heat map and play with ad placement. 11 clicks for 532 impression is low. I have 7 clicks and 178 impressions today. That's a rate of 40 clicks per 1000 impressions and to me that's low.
No, it's not a lot of clicks so don't panic. Getting better - is that 4%? (not having a good maths day) 10% or over is good ctr