Hmm... I can guarantee that this isn't happening on the server. Maybe the problem is that the version of Safari on the iPad is caching all of requests and serving up old/stale data?

Update: I've just added a random variable to the URL used to fetch the test questions. So IF this is the problem, it should be fixed. Can one of you guys let me know? Preferably closing and then reopening Safari first so that you get the latest version of the javascript, or loading from a "new" page like this:

http://wjalskdjf.popupchinese.com/progress