I’m confused

Why does my "Share" button behave differently to other sites with it...?

The "Share" button on my site behaves differently to others. On http://wvs.topleftpixel.com/ or http://www.chromasia.com/iblog/ it works as a drop down menu. On my site it opens the whole widget window as seen here: http://www.escapism-online.com/blog-e... or sometimes it half opens a drop down and then opens the widget at the same time.
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