I own a car forum and have stuck some adsense ads in at the top of my topic pages. The problem is the ads are not displaying anything relevent to the content on my site they have been on there for about a month or so. I thought i would wait a month incase there was some delay on them reading my content. for example a topic about someones new car a ford fiesta mentions the word ford, suspension, exhaust, car, etc etc but the ads show this no matter what the topic is Ads by Google - Yahoo Mail - Sign In - Windows Messenger 9 - Procrastination Log - Log In - Sign Up is this because adwords cannot read into a forum where you have to be a member. the forum is running IPB3 its really bugging me now
Maybe, like you said, Google cant read the content on the page and is displaying other non-relevant ads. You don't need a month to see the right ads. I adjusted mine and saw a change with in 24hrs. Check your titles and see if you can do a bot scan from webmaster tools.