prevent change node type from bare metal to VM

pkg/registrar/register.go

@@ -207,6 +207,11 @@ func registerNode(
 		if err != nil {
 			return 0, 0, errors.Wrapf(err, "failed to get node with id: %d", nodeID)
 		}
+
+        // ignore virt-what value if the node is marked as real on the chain
+        if !onChain.Virtualized {
+           real.Virtualized = false 
+        }
 	}
 
 	real.ID = types.U32(nodeID)
@@ -217,6 +222,7 @@ func registerNode(
 
 	if !real.Eq(onChain) {
 		log.Debug().Msgf("node data have changing, issuing an update node: %+v", real)
+
 		_, err := sub.UpdateNode(id, real)
 		if err != nil {
 			return 0, 0, errors.Wrapf(err, "failed to update node data with id: %d", nodeID)