I configured a hadoop cluster with 4 (machines) nodes with hadoop version 3.4.0. I set the /etc/hadoop workers file with the 4 nodes. I can’t get all the nodes to be displayed under the hadoop gui.

hdfs dfsadmin -report shows all 4 nodes, but on the hadoop gui when logged into hadoop:9870 it only shows 3 nodes under the datanodes section of the hadoop gui. When I did jps on all 4 nodes, it shows datanode in the terminal.
The gui on the front page shows 4 live datanodes, but under the datanodes link next to overview it only shows 3 nodes.
How do I get all 4 nodes shown under the datanodes section. It this a bug issue ?