I tested your app on Android 2.3.5, in Dolphin HD browser - it seems to work fine. I did notice some very minor jumps but that' pretty much how the current jQuery Mobile version works. The other "jumping" is occurring when the page is loaded and the address bar is being hidden.
We are upgrading to jQuery Mobile 1.1 in about one week...it should be much better.
Lastly, there is also custom CSS in the app, test if it works any better without it.