When deploying AEM to an application server with a different context path for publish instances versus author instances, then the Group management console fails to autoscroll.
The same problem occurs for /aemauthor/communites/users.html as well.
This problem only occurs when you have a context configured other than root /.
AEM 6.3 with Communities Package installed
This is caused by the identified product bug CQ-4246013, who has been backported into Service Pack 3.
This service pack will be available on September 12th 2018.
Install AEM 6.3 Service Pack 3.
The link for download will be shared via the public Product Update notification.