This Bible contradiction is from the Skeptic's Annotated Bible.
Esau was Korah's father.
Genesis 36:14 View context
This is so important that it is repeated three times in Genesis 36.
And Aholibamah bare Jeush, and Jaalam, and Korah: these are the sons of Esau, which were born unto him in the land of Canaan.
And these were the sons of Aholibamah, the daughter of Anah the daughter of Zibeon, Esau's wife: and she bare to Esau Jeush, and Jaalam, and Korah.
And these are the sons of Aholibamah Esau's wife; duke Jeush, duke Jaalam, duke Korah: these were the dukes that came of Aholibamah the daughter of Anah, Esau's wife.
And 1 Chronicles agrees, saying:
The sons of Esau; Eliphaz, Reuel, and Jeush, and Jaalam, and Korah.
Eliphaz was Korah's father.
Genesis 36:15-16 View context
These were dukes of the sons of Esau: the sons of Eliphaz the firstborn son of Esau; duke Teman, duke Omar, duke Zepho, duke Kenaz, Duke Korah, duke Gatam, and duke Amalek: these are the dukes that came of Eliphaz in the land of Edom; these were the sons of Adah.