One Page - content placement

Hi. I'm doing a ONE PAGE site http://www.brunocover.com/TMP/insiemenoi-onlus/00-one-page-07.html

I have a problem with content placement: when I go with a first click on CHI SIAMO, the content is cut above (fisrt-click.png). When I make the second click, for example always CHI SIAMO, the content is not located right at the beginning, showing even a portion of the upper content (second-click.png). Also witk the other content, there is a little piece on superior content. Would you be kind enough to show me how to get the content placed in the right way? As in your sample pages for ONE PAGE site (your-content-ok.png). Thanks a lot. Best regards. Bruno

your content in one page site: OK (your-one-page-ok.png)

How I can fix like your one page site right content placement? Thanks a lot

http://www.brunocover.com/TMP/insiemenoi-onlus/00-one-page-07.html

I do not know why the link is broken, the link is right... http://www.brunocover.com/TMP/insiemenoi-onlus/00-one-page-07.html

Perhaps it depends on this css?

.topmargin-lg {
margin-top: 70px !important;