Contradiction with 1 Chronicles 20:4
This verse also describes the battle with Philistines and the killing of a giant, but attributes the act to a different individual, creating a discrepancy in the account of who killed the giant in this specific battle.
1 Chronicles 20:4: And it came to pass after this, that there arose war at Gezer with the Philistines; at which time Sibbechai the Hushathite slew Sippai, [that was] of the children of the giant: and they were subdued. [arose: or, continued: Heb. stood] [Gezer: also called, Gob] [Sippai: also called, Saph] [the giant: or, Rapha]