Hi David,
I think this is a javascript issue, since I’ve noticed after re-sizing the browser the width of the Sunday column normalises. There’s a js error (in EO) which was introduced in 2.5 and fixed in 2.5.1 – so you may want to upgrade first to see if that’s the cause, but I don’t think it is.
If it still doesn’t work, you can identify which of the plug-ins is loading the javascript which is causing the issue, by disabling each in turn and seeing if the problem persists. I’ve identified some of these plug-ins as wpmbytplayer, JetPack, and Magic Action Box. If it is one of these plug-ins, I’d happily take a look and see if there’s anything EO can do (or a fix for that plug-in) to resolve the issue.
Of course, it could be the theme, so lastly, switch to TwentyTwelve. Again, if that resolves, I’ll take a look into it.