Contradiction with Joshua 19:51
This verse indicates that the division of the land was already completed, in contradiction to Joshua 18:2 where the distribution is still pending for some tribes.
Joshua 19:51: These [are] the inheritances, which Eleazar the priest, and Joshua the son of Nun, and the heads of the fathers of the tribes of the children of Israel, divided for an inheritance by lot in Shiloh before the LORD, at the door of the tabernacle of the congregation. So they made an end of dividing the country.
Contradiction with Joshua 11:23
States that Joshua took the whole land according to the Lord's instruction and gave it to Israel as an inheritance, suggesting the land allotment was already accomplished, contradicting Joshua 18:2.
Joshua 11:23: So Joshua took the whole land, according to all that the LORD said unto Moses; and Joshua gave it for an inheritance unto Israel according to their divisions by their tribes. And the land rested from war.
Contradiction with Judges 2:6
Mentions that Joshua had already dismissed the people, each to their inheritance, implying the land allocation was already completed, conflicting with the situation in Joshua 18:2.
Judges 2:6: And when Joshua had let the people go, the children of Israel went every man unto his inheritance to possess the land.