This Bible contradiction is from the Skeptic's Annotated Bible.
1 Machabees 7:32 View context
About five hundred of the army of Nicanor fell, and the rest fled into the city of David.
More than 9,000
2 Machabees 8:24 View context
With the Almighty as their ally, they killed more than nine thousand of the enemy, and wounded and disabled most of Nicanor’s army, and forced them all to flee.