I experienced the issue, that always the first user of the userlist is removed, when I click on the x sign near to the username. This problem only appears when I want to create a new channel. If I just click on the username (not the x), then everything works fine and the current selected user is removed.

Deployment Information:

Version of Rocket.Chat Server: 0.60.4
Operating System: Debian 9.3
Deployment Method(snap/docker/tar/etc): tar
Number of Running Instances: 1
DB Replicaset Oplog: -
Node Version: 8.9.4-1nodesource1
mongoDB Version: 1:3.2.11-2+deb9u1