diff --git a/test/e2e_node/density_test.go b/test/e2e_node/density_test.go
index a8ce0f1c7ea..93959b10c33 100644
--- a/test/e2e_node/density_test.go
+++ b/test/e2e_node/density_test.go
@@ -185,7 +185,7 @@ var _ = framework.KubeDescribe("Density [Serial] [Slow]", func() {
 
 				// verify resource
 				By("Verifying resource")
-				verifyResource(f, testArg, rc)
+				verifyResource(f, itArg, rc)
 			})
 		}
 	})
@@ -242,7 +242,7 @@ var _ = framework.KubeDescribe("Density [Serial] [Slow]", func() {
 
 				// verify resource
 				By("Verifying resource")
-				verifyResource(f, testArg, rc)
+				verifyResource(f, itArg, rc)
 			})
 		}
 	})
diff --git a/test/e2e_node/resource_controller.go b/test/e2e_node/resource_collector.go
similarity index 98%
rename from test/e2e_node/resource_controller.go
rename to test/e2e_node/resource_collector.go
index 9fb4d7f75eb..dcab9db7963 100644
--- a/test/e2e_node/resource_controller.go
+++ b/test/e2e_node/resource_collector.go
@@ -203,7 +203,11 @@ func (r *ResourceCollector) GetBasicCPUStats(containerName string) map[float64]f
 	r.lock.RLock()
 	defer r.lock.RUnlock()
 	result := make(map[float64]float64, len(percentiles))
-	usages := r.buffers[containerName]
+	usages := make([]*framework.ContainerResourceUsage, len(r.buffers[containerName]))
+	// must make a copy of array, otherwise the timeseries order is changed
+	for i, usage := range r.buffers[containerName] {
+		usages[i] = usage
+	}
 	sort.Sort(resourceUsageByCPU(usages))
 	for _, q := range percentiles {
 		index := int(float64(len(usages))*q) - 1