I suppose that explains it a bit. Transylvania Hungarians are the most Balkan-shifted Hungarians and Alfold is the most Balkan-shifted region of Hungary (though you're from northern Alfold which shouldn't be that southern). Its still more southern than I would expect, but it explains your results somewhat. Some people from Alfold can score like normal Hungarians from Hungary while some are significantly different. So your father could be more southern than average even for a Szekler.