Contradiction with 1 Samuel 8:1
This verse states that Samuel made his sons judges over Israel, but 1 Chronicles 6:7 does not mention Samuel's sons in the genealogy.
1 Samuel 8:1: And it came to pass, when Samuel was old, that he made his sons judges over Israel.
Contradiction with 1 Chronicles 6:33
In this verse, the genealogy mentions Heman as the son of Joel, which seems inconsistent with the names given between Joel and Heman in the genealogical line mentioned in 1 Chronicles 6:7.
1 Chronicles 6:33: And these [are] they that waited with their children. Of the sons of the Kohathites: Heman a singer, the son of Joel, the son of Shemuel, [waited: Heb. stood]
Contradiction with 1 Chronicles 6:34
The lineage skips some names between Joel and Samuel as presented in 1 Chronicles 6:7, indicating a different ancestral line or missing generations.
1 Chronicles 6:34: The son of Elkanah, the son of Jeroham, the son of Eliel, the son of Toah,