Additional masters visible in OpenShift 4 install on AWS

Issue

• OpenShift 4 installation on AWS private VPC included the 3 replicas for masters in install-config.yaml

controlPlane:
  hyperthreading: Enabled
  name: master
  platform:
    aws:
      rootVolume:
        size: 150
      type: m5a.xlarge
  replicas: 3

• The installation shows 6 masters and 3 worker nodes and the cluster operator install fails.

[root@bastion openshift]$  oc get machines 
NAME PHASE TYPE REGION ZONE AGE 
ocp-abcd-xyz-master-0 Running m5a.xlarge region_name zone_name 13m 
ocp-abcd-xyz-master-1 Running m5a.xlarge region_name zone_name 13m 
ocp-abcd-xyz-master-2 Running m5a.xlarge region_name zone_name 13m 
ocp-abcd-xyz-worker-region_name-c9484 Running m5a.xlarge region_name zone_name 6m3s
ocp-abcd-xyz-worker-region_name-jn6b8 Running m5a.xlarge region_name zone_name 6m3s 
ocp-abcd-xyz-worker-region_name-zhpb5 Running m5a.xlarge region_name zone_name 6m3

[root@bastion openshift]$  oc get nodes 
NAME STATUS ROLES AGE VERSION 
ip-10-xx-xx-xx.ec2.internal Ready master 2m32s v1.18.3+3107688
ip-10-xx-xx-xx.ec2.internal Ready worker 2m25s v1.18.3+3107688 
ip-10-xx-xx-xx.ec2.internal Ready master 11m v1.18.3+3107688 
ip-10-xx-xx-xx.ec2.internal Ready master 11m v1.18.3+3107688 
ip-10-xx-xx-xx.ec2.internal Ready master 2m36s v1.18.3+3107688 
ip-10-xx-xx-xx.ec2.internal Ready master 11m v1.18.3+3107688 
ip-10-xx-xx-xx.ec2.internal Ready worker 2m36s v1.18.3+3107688 
ip-10-xx-xx-xx.ec2.internal Ready master 2m35s v1.18.3+3107688
ip-10-xx-xx-xx.ec2.internal Ready worker 3m11s v1.18.3+3107688