If some or none of the ads are showing on your site, this could be because you’ve placed too much ad code on your site. Remember, as per Google Adsense valuable inventory policy, you may not place more Adsense ads than content on your page. Placing more Adsense Google ads than content on your page may prevent some or all of your ads from showing.
To verify that your Google AdSense code has been properly implemented, first open your site in a browser and view the source code (select ‘View’ then ‘Source’ or ‘Page Source’). Next, compare the AdSense code in your page source with the code from your AdSense account.