What do you mean? if you meant what interaction that causes the problem
then it is (int-3/4/5/6) (the interaction of solid faces with middletendon)
however, i also tried to create ons set of all surfaces and define one iteraction but nothing was solved.
Steps i used to check the normalare as follows:
try to run the model/ go to results/ common plots/ trun on Normals/ you can see that the normal vectors are pointed out, however, they should be oriented inside to interact with the middletendon
Thank You,