It's because it uses an iframe to display the results; google no longer supports iframes:
https://support.google.com/customsea.../2641279?hl=en
To correct this google recommends using the two page or results only settings. You can do this, then get the code and replace the template script at the bottom of the yilmaz_google_arama_kutusu_sayfa template.
Attached is an example replacement product template. You can see it working on
http://www.ukcigarforums.com