diff --git a/packages/x6-plugin-selection/src/selection.ts b/packages/x6-plugin-selection/src/selection.ts
index 90dd609ee7c..ea7b53fe350 100644
--- a/packages/x6-plugin-selection/src/selection.ts
+++ b/packages/x6-plugin-selection/src/selection.ts
@@ -468,12 +468,12 @@ export class SelectionImpl extends View<SelectionImpl.EventArgs> {
         }
       } else {
         const scale = this.graph.transform.getScale()
-        for (let i = 0, len = this.$boxes.length; i < len; i += 1) {
-          this.updateElementPosition(
-            this.$boxes[i],
-            dx * scale.sx,
-            dy * scale.sy,
-          )
+        for (
+          let i = 0, $boxes = this.$boxes, len = $boxes.length;
+          i < len;
+          i += 1
+        ) {
+          this.updateElementPosition($boxes[i], dx * scale.sx, dy * scale.sy)
         }
         this.updateElementPosition(
           this.selectionContainer,
@@ -848,10 +848,15 @@ export class SelectionImpl extends View<SelectionImpl.EventArgs> {
   confirmUpdate() {
     if (this.boxCount) {
       this.hide()
-      for (let i = 0, len = this.$boxes.length; i < len; i += 1) {
-        const box = this.$boxes[i]
+      for (
+        let i = 0, $boxes = this.$boxes, len = $boxes.length;
+        i < len;
+        i += 1
+      ) {
+        const box = $boxes[i]
         const cellId = Dom.attr(box, 'data-cell-id')
         Dom.remove(box)
+        this.boxCount -= 1
         const cell = this.collection.get(cellId)
         if (cell) {
           this.createSelectionBox(cell)