The discrepancy between the numbers here and in Nehemiah Nehemiah 11:8 may arise from corruption. So in 1 Chronicles 9:13, 1 Chronicles 9:22.
Related Commentaries of 1 Chronicles 9:9
1 Chronicles 9:9
9 And their brethren, according to their generations, nine hundred and fifty and six. All these men were chief of the fathers in the house of their fathers.