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It's fine to have it on other pages so if they navigate away from the landing page there is the chance of revenue then.
Keep the landing page itself free of adsense for a few days and see if that helps. Also don't be afraid to have a live chat with the google reps for their advice if you're having problems. They're generally extremely helpful and knowledgeable and so long as you're trying to offer the user a good experience (selling them something does actually count!) they might be able to offer suggestions.
If that doesn't work try using the help/ contact menu from within adwords. Often when you start selecting help options, the live chat option appears.
One of those two should work.