Description of problem: The worker nodes and one of the master nodes were upgraded after 15 days of the last cluster upgrade instead of the same day. Due to some reason, the node upgrade was pending and then automatically triggered. It looks like the last upgrade was incomplete or partial because the os update is done only on few nodes which were not updated previously Version-Release number of selected component (if applicable): OpenShift 4.6.36 The cluster was upgraded from 4.6.32 to 4.6.36 on 2021-07-18. Actual results: There are 3 masters, 3 infra, 12 workers nodes in the cluster, out of which all worker nodes and 1 master node were upgraded on 1st and 2nd August instead of the same day of cluster upgrade. Expected results: The nodes should have been upgraded on 2021-07-18. Additional info: The cluster is running over AWS GovCloud as a BareMeatal installation (Disconnected). I will be sharing the cluster must-gather.