Contradiction with 2 Samuel 24:1-2
This verse describes God inciting David to conduct a census of Israel, which later results in punishment, suggesting a contradiction in the acceptability of taking a census.
2 Samuel 24:1-2: And again the anger of the LORD was kindled against Israel, and he moved David against them to say, Go, number Israel and Judah.
Contradiction with 1 Chronicles 21:1-2
Here, Satan incites David to take a census, and it's depicted as sinful, contradicting the command to Moses to conduct a census in Numbers 26:2.
1 Chronicles 21:1-2: And Satan stood up against Israel, and provoked David to number Israel.
Contradiction with Exodus 30:12
This verse warns of a plague if a census is taken without a ransom, implying a contradiction since Numbers 26:2 does not mention any warnings or conditions.
Exodus 30:12: When thou takest the sum of the children of Israel after their number, then shall they give every man a ransom for his soul unto the LORD, when thou numberest them; that there be no plague among them, when [thou] numberest them. [their number: Heb. them that are to be numbered]