Contradiction with 1 Samuel 16:13
1 Samuel 16:13 describes the anointing of David, while 1 Chronicles 26:31 discusses the leadership of the Hebronites, suggesting a different leadership focus.
1 Samuel 16:13: Then Samuel took the horn of oil, and anointed him in the midst of his brethren: and the Spirit of the LORD came upon David from that day forward. So Samuel rose up, and went to Ramah.
Contradiction with 2 Samuel 5:4
2 Samuel 5:4 indicates David became king at a young age, whereas 1 Chronicles 26:31 mentions Hebronite leadership at a later age.
2 Samuel 5:4: David [was] thirty years old when he began to reign, [and] he reigned forty years.
Contradiction with 1 Chronicles 11:1-3
1 Chronicles 11:1-3 details David's anointing as king over Israel, in contrast to the focus on Hebronite leadership in 1 Chronicles 26:31.
1 Chronicles 11:1-3: Then all Israel gathered themselves to David unto Hebron, saying, Behold, we [are] thy bone and thy flesh.