I saw your website. It is based on the twentyeleven theme, but it has been badly hacked. I see that just below “Past Retreats” a lot of unnecessary paragraphs and nbps spring out, it is not a matter of css. Probably the hacked page template adds them when it generates the page, so you will not notice them in the editor.
Only way is to have a look at the template, and eliminate the unnecessary lines.
