For people that are confused/misunderstanding this (such as some other comments), the activities with matchmaking enabled will reset your custom modifier selection you picked for the non-matchmade version when you go to relaunch it; having the training difficulty completed does not matter for it. You can test it out by setting custom modifiers on an activity that has a matchmade option (ie Reclaim), loading into it and then leaving, and then checking your modifiers once you leave - they'll be reset. Its likely a bug with the matchmade version being considered the only 'saved' version due to it being fixed modifiers. You may want to post over in #Help about it to see if BNGHelp can give some light on it.