When updating the flightplan form, for example Emergency Radio, after entering ELT, I pressed the arrow left on Android and was thrown out of the flightplan form. When I do it at my desk, it seems to work better, at the airport, with mobile data, it was impossible to enter data.
I would prefer the sub-forms of the flightplan form to have their own 'back' button instead of relying on the left arrow of Android. If you press the left arrow too long you loose the information you just entered.

When you say the left arrow, are you referring to Android's back button? It isn't clear exactly what you're doing.