well, in that case there's a problem with wp super cache, as in the homepage's HTML source I see;
<!-- Dynamic page generated in 16.436 seconds. -->
<!-- Cached page generated by WP-Super-Cache on 2015-02-16 08:24:19 --><!-- Compression = gzip -->
<!-- super cache -->
Afraid I can't tell you how, but in order for the HP to work, you'll have to find a way to remove that old version from WP Super Cache's cache.