Error format table on forums

Hello

I’m trying the Social theme for a future Ning migration and I have a problem in Forum page. The table that list the forums is not showing properly. I don’t know how to explain it in english, but you can see here http://triangulodelasbermudas.net/sitio/forums/

If I create a page with shortcode to show the forum list I have the same problem:

http://triangulodelasbermudas.net/sitio/foros-2/

Lok at the columns title!

thanks