When you scrolling through keys on a newly installed list, two positions on two separate lists light up and indicate they both have the key.
What has happened is that the first time you mount the lists in the cabinet, they are assigned an ID, and it has happened that the lists have been assigned the same ID, effectively being cloned of one another. The lists work but cannot work in the same cabinet. The solution is to remove one list and replace it with another and mount the other list in another cabinet.
See example imbedded in this article.