Adsense Showing alternate ads

[Neogen]

Hi,

I have on google adsense account, that I am using to for displaying ads on three of my site.

One site is perfect, one site its showing mix of ads, however on other site its only showing alternate ads. It has never shown any ad.

Any clue, why is this happening.

[Jenstar]

The most common problem is that you could have stop words [google.com], in which case you won't show ads until they are removed.

Another thing to check, could be that you have blocked the media partners bot with robots.txt or meta tags.