Content from <p> disappears when I return to the page

[r0bsN]

I'm facing a strange problem. I use a HTML template and it's actually only one page with a box in the middle. The content of the box can change and you navigate to the different version by some buttons at the top of the page.I have added a paragraph in the landing view and when I move to another view and return back the text disappears.I can see that the problem isn't that it doesn't show the text, the problem is that it completely disappears and only leaves:\[code\]<div id="comment2" class="one-half"></div>\[/code\]I cannot figure out what causes it though.Here's my HTML:\[code\]<div id="content_wrapper"> <div id="header"><span>