Hello! I am also having the same issue. I have only tested it when hosting a "Social" server. It occurs with 4+ total users including the host, 70% of the time. The bottom user can be highlighted, but the options to mute, kick and ban cannot be highlighted. The icons are present, but they cannot be clicked. In order to kick the user at the bottom of the player list, you must first kick the users above them. The issue can be resolved by performing a Roll Back. I hope that helps!