Contradiction with 2 Kings 18:1-3
While 2 Kings 15:23 discusses the reign of Pekahiah, son of Menahem, who did evil in the sight of the Lord, 2 Kings 18:1-3 speaks of Hezekiah, king of Judah, who did what was right in the eyes of the Lord.
2 Kings 18:1-3: Now it came to pass in the third year of Hoshea son of Elah king of Israel, [that] Hezekiah the son of Ahaz king of Judah began to reign. [Hezekiah: he is called Ezekias]
Contradiction with 2 Kings 15:16
In contrast to the brief mention of Pekahiah's reign in 2 Kings 15:23, 2 Kings 15:16 discusses King Menahem's violent actions and reign, showing how different kings handled power differently.
2 Kings 15:16: Then Menahem smote Tiphsah, and all that [were] therein, and the coasts thereof from Tirzah: because they opened not [to him], therefore he smote [it; and] all the women therein that were with child he ripped up.
Contradiction with 2 Chronicles 28:1-4
Describes the reign of Ahaz, who, like Pekahiah, did not do what was right in the sight of the Lord, countering the notion that most kings followed David's righteous path.
2 Chronicles 28:1-4: Ahaz [was] twenty years old when he began to reign, and he reigned sixteen years in Jerusalem: but he did not [that which was] right in the sight of the LORD, like David his father: