Played around some more tonight and did some additional testing. This time wasn't nearly as smooth as the first time yesterday.
The app had a lot of trouble connecting to both H9s. Upon opening the app, "Connecting" would spin, they would connect, then disconnect (sometimes several times) and the app would go into Demo Mode.
We just published a new beta (v3.0.4) that should help with this problem of reconnecting to multiple H9s. Basically, we were trying to reconnect all previously connected devices simultaneously, and we found that if we instead reconnect them one at a time that seemed to fix the problems you were seeing.