That is the format that ACF stores date in the DB. You either need to use an ACF function or filter the value being used by the other plugin. I don’t know how that other plugin works, but what you need to do is figure out how to filter the values that it’s displaying. You need to as them how to do that. Once you figure out how to do that
$date = date('jS F Y', strtotime($value_from_db));
