Contradiction with Proverbs 22:6
Contradicts the notion of Ahaz being wicked, as it implies good training results in a righteous individual.
Proverbs 22:6: Train up a child in the way he should go: and when he is old, he will not depart from it. [Train...: or, Catechise] [in...: Heb. in his way]
Contradiction with 2 Kings 16:2
Conflicting ages of Ahaz's reign imply a lack of consistency in his character throughout his time as king.
2 Kings 16:2: Twenty years old [was] Ahaz when he began to reign, and reigned sixteen years in Jerusalem, and did not [that which was] right in the sight of the LORD his God, like David his father.
Contradiction with Deuteronomy 30:15-18
Presents the idea that choosing life and good leads to blessings, whereas Ahaz chose evil yet still reigned.
Deuteronomy 30:15-18: See, I have set before thee this day life and good, and death and evil;
Contradiction with Psalm 37:25
Suggests the righteous are never forsaken, yet Ahaz, who was evil, continued to experience worldly success.
Psalm 37:25: I have been young, and [now] am old; yet have I not seen the righteous forsaken, nor his seed begging bread.