symmetry problems

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Good morning guys, I'm simulating a simple compression test on a test that has 2 symmetry levels. in practice to speed the calculations I reproduced only 1/4 of the geometry and assigned the symmetry. But as you see from deformation there is something wrong. Can you tell me where I'm wrong? as bond I put fixed base and 3mm shift on the upper face. I'll train your screens. Thank you.

 

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I would also like to understand by normal symmetry what he means? I'll get you another picture. Thank you.