completed actions deleted after sync with iTouch

I am using the Nozbe 2.0 app on my iTouch. After checking off completed actions and performing a sync, I cannot find them when I access my account online. They seem to have been deleted. Online, the only completed actions that show up in the “completed actions” tab are the ones I previously checked off online. On my iTouch, the only completed actions that show up are the ones I checked off on my device. This is very frustrating because it means that I have two separate (and incomplete) lists of actions for the same project (though the next actions remain intact in both places).