Problems with » rendering improperly

I never run into this problem before. I am using the Events plugin and on the ‘More’ and ‘More Information’ links for each event listed there is a &raquo that isn’t rendering properly. While technically this isn’t strictly a WP question, it is the first time I have seen this and this is the first major WP site I have worked on.

Could somebody take a look at: https://wmu.texasbaptists.com/wordpressmu/ and help me understand why the &raquo is rendering as a question mark in a diamond on the Mac and an empty square on a WinPC? (Look for the ‘More Information’ link.

This renders this way on my custom theme and on the default wp theme.

TIA.