diff --git a/pkg/drawio/subnetsLayout.go b/pkg/drawio/subnetsLayout.go
index 1b81d9c96..b8a8d5128 100644
--- a/pkg/drawio/subnetsLayout.go
+++ b/pkg/drawio/subnetsLayout.go
@@ -497,7 +497,9 @@ func (ly *subnetsLayout) calcZoneOrder() {
 			}
 		}
 	}
-	zoneOrders = append(zoneOrders, zoneOrder)
+	if len(zoneOrders) > 0 {
+		zoneOrders = append(zoneOrders, zoneOrder)
+	}
 	ly.setZonesCol(zoneOrders)
 }