I noticed in the past year or so that there was a change in the MathJax that results in every MathJax equation being doubled, one being an image and one being a text-based rendering. Usually one of them is hidden, but sometimes the doubles are positioned corner to corner, as shown here. As was already noted, a hard-refresh (Ctrl-F5) usually resolves the problem, but there is another problem caused by the same issue, which is that Google search has all MathJax appearing twice, such as this. As you can see, this problem did not exist prior to the change in the MathJax renderer. Can this be solved somehow, if not Google will become less useful for searching Math SE?
Below is a screenshot of the link as rendered in my browser (a Firefox derivative). The same thing happens with IE9.
And here is the HTML source for the snippet of the first result in the above:
<span class="st"><span class="f">2 days ago - </span>Let G G be a <em>group of order p2</em> p 2 where p p is a prime. I want to show that either G G is cyclic or is the product of two cyclic <em>groups of order</em> p p ...</span>