Contradiction with Genesis 23:6
This verse does not directly contradict Genesis 23:5, but rather continues the dialogue where the Hittites honor Abraham by offering him a choice of their sepulchres, which might suggest a contradiction only in terms of interpreting Abraham's status or intentions.
Genesis 23:6: Hear us, my lord: thou [art] a mighty prince among us: in the choice of our sepulchres bury thy dead; none of us shall withhold from thee his sepulchre, but that thou mayest bury thy dead. [a mighty...: Heb. a prince of God]