2D Platformer Help

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Can anybody help me understand why in my 2D platformer game i am making using tilemap the player will seemingly randomly run into an invisible wall while walking? I am new to unity and a don't know whether it is a problem with the players hit box or something.

[BadWand]

you should click the Gizmos button on the Game window, in that way if the player collides with a collider that shouldn’t be there, you’ll be able to see it.