Ads aren't relevant on just one specific page.

Ads on all other pages of same site are fine.

[Perfection]

For the last month, just one specific page of my site has been showing ads that are very off from the subject of the page and my site in general. Pretend my site is about fruit, and this page is about apples... the ads are for anti-virus software. They are THAT off.

And, I am 99.9% sure this page did NOT have this problem prior to about a month ago. Checking with the Adsense preview tool, it shows only these non-relevant ads for this page.

I have another 3 pages of the same site that are very similar in subject to this page. They all discuss the same subject. However, just this one page is having the ad problem.

What would be causing this, and better yet, how do I fix it?

[briggidere]

rather than looking at the specific page, have a look at the source code of the page.
this could maybe shed some light on the problem. as this is what the ads are dependant on you may see something that shouldn't be there and could be removed easily.

[21_blue]

This has happened 3 or 4 times to us. Email support and ask them to reset the page.

[bumpski]

Also make sure the page is fully indexed by Google. Use the "site:" directive to the specific page.
Example
site:www.google.com/adsense/tips (Note Google is not using "htm" suffixes, you may have to for your page).

Does this show a Title and Description or perhaps there is no Title or Description, just a URL?

I have repeatedly found that pages that are in this URL only or partially indexed state show less relevant ads.

Another possibility is the page is indexed at another domain, perhaps google.com instead of www.google.com.