Cluster deny is not a valid IP/CIDR

Pressing the Cluster Allow and Cluster Deny buttons in the 8.17 GUI give you this same error. Cluster allow is not a valid IP/CIDR or Cluster deny is not a valid IP/CIDR I can mod the files directly via SFTP or term, but the other cluster members are not picking up the changes. Can restart CSF in term without error. Can ping, send config to members and restart cluster just fine within GUI. Why wont Cluster Allow, Cluster Deny and Cluster Remove buttons work without error? Do I have a server config file that needs editing somewhere? If I manually edit the csf files on the slaves they ignore the changes, even after a flush and restart, so they act like they want to listen to the Master. Changes made to the csf.* files on the master though are not propagating to the slaves. Any idea on the gui error message or how to troubleshoot the partial communication? I added all of the servers in the cluster to the csf.allow files on each server, including the master.