Onepage Menu stops working from different page

Good evening.
I’m with the following problem, I made the site in sections and when I click on the sections it moves further to go when I click on a contact page that it does not in another url back when I click on any section, as I fix this for you to understand better access http://www.cloudesign.com.br
then click on contact and then click Service.
is this is problem I’m having.
thank you bye.