User blog comment:Kirkburn/Technical Update: October 1, 2013/@comment-1997588-20131003134418/@comment-126761-20131003151428

I think this could be related to some text size tweaks - the text is too wide for the box it is in.

It looks like this is being defined in http://sims.wikia.com/wiki/MediaWiki:Common.js by Button.style.width = "2em"; - I suggest bumping it to 3em.