I got a very strange adsense problem on one of my blogs the problem is that some ad blocks appear (just 1 of 3 blocks) the other 2 does not appear to all visitors like to link ads only 2 appear and 1 do not appear for my surprise also the appearing adsense block show "show more ads" which means that there are ads relevant to my blog also i tried replacing the code with new one , move the placement but always just 1 block and 2 link ads appear my blog is http://nogoomfm.blogspot.com/
To me, this is a weird problem. You should try to contact them directly to let them know your situation. You can email them at ( adsense-support @ google.com ) or there is a contact form available at www.google.com/adsense/support/bin/request.py
Which is the blogger platform being used by you some of the platforms have the problem of blocking javascripts if there are too many of them trying to speak at the time of loading
When you are on the page designing the look of your adsense code there are three options for which you can choose when there are not enough relevant ads for your keywords. You can have it collapse (i.e. show nothing) or you can have it use a blank fill color or you can select it to show the "view other ads". Make sure you know which one you are choosing and what it will do on your page. Other than that, do a rework of the content on the page and your metatag keywords and the problem will most likely go away through better optimization. Good luck
I have same kind of problem, here is my blog http://a1onlinejobs.blogspot.com/ on the top, there should be a ad link which isnt showing up