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Unexpected deformation in nonlinear analysis with contact

deformed
undeformed
Hello,
 
I make nonlinear analysis with touched contact. My model made by 3d shell elements on Marc Mentat. I have force on shell body which bends and have contact with other shell body. My contact is between two deformable shell with two shell bodies which are parallel.
 
I conduct nonlinear analysis but get unexpected deformation. When I look the results deformed shape is initial shape ( undeformed shape ), orjinal shape is deformed shape but is opposite direction to force direction.
 
When I conduct analysis without contact deformation is like expected. I don't know what is reason for this unexpected deformation.
 
Two picture shows result and force direction which is applied. Thank you for your suggestions.
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