How to fix collision

Hello, guys can you help me fix this?

If you see it’s normal yes.

But look

It’s not square.
And when a player tries to go upstairs, it interferes with the player

Seems to be a union just use 4 parts imo

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Just use parts for it there’s no reason to have that be a union in the first place.

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Check your Mesh’s/Union’s CollisionFidelity and see what collision suits your needs. Sometimes this may not solve your problem.

You could have used parts instead.