You could try the following. Change on the newly added system the Commend Field within the cluster setup. Change every entry not just his own. Go to one of the existing nodes and check that the change that was made is also changed on that node. If that is the case do a Full Sync from the existing node to the newly added node. You should select the data repair to yes.( MAKE SURE THAT THE SYNC IS DONE FROM EXISTING NODE TOWARDS THE NEWLY NODE)