Please read this discussion. The keyops applied to elements are very important to have hyperelastic materials converge. Since these are quad PLANE182 elements, keyop(1)=1 is for Uniform Reduced Integration, while that is keyop(2)=1 on a SOLID185 hex element. Note that Tet elements don't have an option for Uniform Reduced Integration.
You are navigating away from the AIS Discovery experience