In my simulation, some of the corner nodes can be put in the wrong place. Can you advise what the problem is?

In the sharp corner regions, such as narrow bead, when there is penetration of the node into the rigid body, this slave node can be mistakenly regarded as the slave node of another surface. To avoid this problem, use a small value of XPENEN in the card of *CONTROL_CONTACT. However this value cannot be too small, otherwise, this node can be released from the previous contact.