Not sure if it's a bug or not, but I thought you took out all the ads with audio. I find them annoying, and am sure many others do too.
We don't allow our advertisers to use them, but there are thousands of ads on the site, so once in a while one slips through. If you can send details about which ad it was and which page you found it on, we can remove it. Thanks!
Customer support service by UserEcho