Axial force on a bolt is not right

Hi all

This is my model, it is nonlinear because I am using a 2 rubber seals

Well I using 17N*M preload on the bolt, M12 bolt

The axial force supposed to be 7083N but I am getting only 52.8N

Can anyone see what is wrong?

thanks

oshri nitzan

SolidworksSimulation