Contradiction with Numbers 3:39
Numbers 3:22 mentions the number of the Gershonites, while Numbers 3:39 provides the total count for all Levites, which might seem inconsistent if considering the counts of other clans collectively.
Numbers 3:39: All that were numbered of the Levites, which Moses and Aaron numbered at the commandment of the LORD, throughout their families, all the males from a month old and upward, [were] twenty and two thousand.
Contradiction with Numbers 4:2-3
While Numbers 3:22 lists the number of the Gershonites specifically, Numbers 4:2-3 only identifies men of service age from each group, implying indirect considerations of entirely different numbers for service.
Numbers 4:2-3: Take the sum of the sons of Kohath from among the sons of Levi, after their families, by the house of their fathers,