cluster membership change detected results in "Xcenter cluster processes are stopping"

We have a two node windows tomcat cluster environment where we have v17 xcenter deployed.

In the log files from node 1 and node 2 we keep seeing the following

"cluster membership change detected."

followed by the message

"Xcenter cluster processes are stopping..."

I looked up the   and studied the Doc ID: 1994467.1 and the Xstore Implementation and Securities Guide.  For 16.0.2 Look under section G-4 , Running Multiple Xstore Office Instances in a Cluster.

As per the guide we need to make sure following ID is unique in each of the server

On Node 1

cluster.server-number=1

On Node 2

cluster.server-number=2

But the log files are not giving me enough details to determine why there is a change detected?