Contradiction with Numbers 7:84
Numbers 7:86 specifies the total weight of the silver chargers, but the total weight in Numbers 7:84 is different.
Numbers 7:84: This [was] the dedication of the altar, in the day when it was anointed, by the princes of Israel: twelve chargers of silver, twelve silver bowls, twelve spoons of gold:
Contradiction with Exodus 38:25-26
These verses explain a different allocation of silver for the service of the tabernacle, contradicting the allocations and weights described in Numbers 7:86.
Exodus 38:25-26: And the silver of them that were numbered of the congregation [was] an hundred talents, and a thousand seven hundred and threescore and fifteen shekels, after the shekel of the sanctuary: