Mandigo theme sidebar moves

I use Mandigo theme, width 1024, one column one sidebar. In a specific post (with a picture) the sidebar moves on the right, getting outside the theme. My blog is http://blogs.sch.gr/stelam and it happens when I search post “The image of the other 9, Goodbye”. But when I click on this post, the sidebar is ok again. Maybe it is not so important but I cannot understand why it happens.