Ohhh, Mecway makes a trick that add an extra empty step to the models with contacts to keep the contact stiffness constant during the step!!! We don´t see that step in the interface, but is in the input file passed to the solver:
I have tryed removing that extra step and then there are some issues in the contact, similar to your last animation.
Look in my input files that extra step, and copy all the cards to your Prepomax model by means of the CCX input deck editor.