Contradiction with Joshua 13:30
While Psalm 60:7 assigns Gilead and Manasseh to God, Joshua 13:30 describes these lands as inheritances for the tribes, implying human ownership.
Joshua 13:30: And their coast was from Mahanaim, all Bashan, all the kingdom of Og king of Bashan, and all the towns of Jair, which [are] in Bashan, threescore cities:
Contradiction with Numbers 32:39-40
Psalm 60:7 claims ownership of Gilead for God, but Numbers 32:39-40 describes Moses giving Gilead to the descendants of Machir, the son of Manasseh, for possession.
Numbers 32:39-40: And the children of Machir the son of Manasseh went to Gilead, and took it, and dispossessed the Amorite which [was] in it.
Contradiction with Deuteronomy 3:13
Psalm 60:7 identifies Manasseh as belonging to God, whereas Deuteronomy 3:13 records it being given to the half-tribe of Manasseh.
Deuteronomy 3:13: And the rest of Gilead, and all Bashan, [being] the kingdom of Og, gave I unto the half tribe of Manasseh; all the region of Argob, with all Bashan, which was called the land of giants.
Contradiction with Joshua 17:1
While Psalm 60:7 asserts that land and people mentioned are God's, Joshua 17:1 specifically states that the land was given to the tribe of Manasseh.
Joshua 17:1: There was also a lot for the tribe of Manasseh; for he [was] the firstborn of Joseph; [to wit], for Machir the firstborn of Manasseh, the father of Gilead: because he was a man of war, therefore he had Gilead and Bashan.