Contradictions in Doctrine (Godhead)

Mosiah 13:34; “Have they not said that God himself should come down among the children of men, and take upon him the form of man, and go forth in mighty power upon the face of the earth?”

1 Cor. 14:33; “For God is not the author of confusion, but of peace, as in all churches of the saints.”

Why don’t Mormons believe this passage in Mosiah?