You have large penetration and mesh distortion at the end here:
So I would correct the tie constraints and contact (including master/slave assignment - there are specific rules: Selection master and slave in contact) first. You can play with position tolerance and adjustment settings to make sure ties work properly. Then try refining the mesh, it’s pretty coarse currently. Since there are no hybrid elements in CalculiX and volumetric locking is of concern when using hyperelastic materials, I would recommend reduced integration elements.