Interestingly if I start a new party, I can see the experienced characters with their full decks listed in them...
However, I still have an empty party in the Story page with no characters and just a '.' in it for the scenario.
It seems I can progress with the experienced characters in a new party and I think I'm not loosing anything there, but would be interesting to know what happened and if it can be repaired. Might also help isolate a bug, to prevent confusion or scared users or quality concerns in the future, because the port of the card game to android is really really good. Would hate little things like this to scare people off or give bad word of mouth.