Does uttering the word "Malik" (king) instead of "Maalik" (owner) in Surat Al-Fatiha invalidate the prayer, and how are missed prayers to be made up?

Asim and Al-Kisa'i recited: {مَالِكِ يَوْمِ الدِّينِ} (Maliki Yawm al-Din) with an alif, while the others recited: {مَلِكِ يَوْمِ الدِّينِ} (Maliki Yawm al-Din) without an alif. Both recitations are correct, your prayer is valid, and you do not need to repeat it.