Contradiction with 1 Chronicles 6:28
This verse lists different sons of Samuel, creating a genealogical contradiction with 1 Chronicles 6:30.
1 Chronicles 6:28: And the sons of Samuel; the firstborn Vashni, and Abiah. [Vashni: called also Joel]
Contradiction with 1 Samuel 8:2
This verse names Joel and Abiah as the sons of Samuel, which differs from the names given in 1 Chronicles 6:30.
1 Samuel 8:2: Now the name of his firstborn was Joel; and the name of his second, Abiah: [they were] judges in Beersheba.