This is on a Raspberry Pi of recent purchase and does not happen on Iceweasel:
https://www.google.com/search?q=site:http://secretnumbers.org/&gws_rd=ssl
----------------Returned to my screen: Copy/paste-----------
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It's likely the case that you're using Midori 0.4.3 from the debian repositories, which is very far out of date and which has a different user-agent string than current Midori (as well as differing in HTTP and cookie handling); please try a current version of the browser if this is the case and reply if the problem still occurs.