Reciting some portions or verses from the Quran after Al-Fatihah in the first two Rak’ahs of the prayer is a desirable and not obligatory Sunnah, according to the view of the majority of the scholars ...

However, to me it feels like the imam of our masjid makes a mistake in the recitation of al-fatiha that alters the meaning. He interchanges the "small" ha with "big" Ha when reciting ehdina assiraat ...