This Bible contradiction is from the Skeptic's Annotated Bible.
With the other kings in Jerusalem.
2 Kings 12:20-21 View context
And his servants arose, and made a conspiracy, and slew Joash in the house of Millo, which goeth down to Silla.
For Jozachar the son of Shimeath, and Jehozabad the son of Shomer, his servants, smote him, and he died; and they buried him with his fathers in the city of David: and Amaziah his son reigned in his stead.
In Jerusalem, but not with the other kings.
2 Chronicles 24:24-25 View context
For the army of the Syrians came with a small company of men, and the LORD delivered a very great host into their hand, because they had forsaken the LORD God of their fathers. So they executed judgment against Joash.
And when they were departed from him, (for they left him in great diseases,) his own servants conspired against him for the blood of the sons of Jehoiada the priest, and slew him on his bed, and he died: and they buried him in the city of David, but they buried him not in the sepulchres of the kings.