Came to this forum for the first time because of this exact problem.
Happens with Opera 34.0.2036.25, using google.com.au, no problems with other browsers or other search engines. I've found that this happens on two different computers (one desktop pc and one laptop, both with Win 10 64 bit): as they have different screen resolutions, I don't think this is a problem with resolutions.

No idea what to do about this