1) make sure you are using the meta tags provided by ratchet.
2) make sure you are inserting the bar-tab navigation at the top right after the body
From the ratchet getting started guide:
1. Fixed bars come first
All fixed bars (.bar) should always be the first thing in the of the page. This is really important!
2. Everything else goes in .content
Anything that's not a .bar should be put in a div with the class .content. Put this div after the bars in the tag. The .content div is what actually scrolls in a Ratchet prototype.
3. Don't forget your meta tags
They're included in the template.html page included in the download, but make sure they stay in the page. They are important to Ratchet working just right.
If that doesn't help post some code and let us take a look at it