Contradiction with Matthew 8:4
John 6:15 describes Jesus withdrawing to avoid being made king, while Matthew 8:4 depicts Him instructing a healed man to tell no one, highlighting different approaches to avoiding public attention.
Matthew 8:4: And Jesus saith unto him, See thou tell no man; but go thy way, shew thyself to the priest, and offer the gift that Moses commanded, for a testimony unto them.
Contradiction with John 18:36
John 6:15 shows Jesus avoiding an earthly kingship, whereas John 18:36 states that His kingdom is not of this world, indicating a clear disinterest in earthly rule, without the need for evasion.
John 18:36: Jesus answered, My kingdom is not of this world: if my kingdom were of this world, then would my servants fight, that I should not be delivered to the Jews: but now is my kingdom not from hence.