Contradiction with Deuteronomy 1:17
While Exodus 18:26 suggests that only smaller matters should be judged by others, Deuteronomy 1:17 states that judges must not show partiality and should bring difficult cases to higher authority, indicating a broader sharing of judgment.
Deuteronomy 1:17: Ye shall not respect persons in judgment; [but] ye shall hear the small as well as the great; ye shall not be afraid of the face of man; for the judgment [is] God's: and the cause that is too hard for you, bring [it] unto me, and I will hear it. [respect...: Heb. acknowledge faces]
Contradiction with Numbers 11:14
Exodus 18:26 describes a system where leaders judge smaller matters to reduce Moses's burden, yet Numbers 11:14 reflects Moses's previous complaint about the inability to handle the burden of the people alone, before implementing shared judging.
Numbers 11:14: I am not able to bear all this people alone, because [it is] too heavy for me.