Please properly explain whether you have added the code directly in your theme or used the plugins for this ?

No, I’m not currently using any plugin to show ads. I have added google adsense verification code directly into the theme header.php file. There is a new option in google adsense called “page level ads”. I just enabled it to activate showing ads in all pages(we dont need to paste any other code in theme files). Then it started to show ads randomly. But the ads always targetting navigation menu and expand it.

Since “page level ads” is working fine in most of the site, I thought that it would be a problem with theme. Is there anything i need to modify?