Contradiction with 2 Samuel 21:19
This verse attributes the killing of Goliath's brother Lahmi to Elhanan, not to Jonathan, contradicting the account in 1 Chronicles 20:7.
2 Samuel 21:19: And there was again a battle in Gob with the Philistines, where Elhanan the son of Jaareoregim, a Bethlehemite, slew [the brother of] Goliath the Gittite, the staff of whose spear [was] like a weaver's beam. [Jaareoregim: or, Jair]