diff --git a/src/sandbox/patchers/dynamicAppend/common.ts b/src/sandbox/patchers/dynamicAppend/common.ts
index 79f2fb9..7a927ac 100644
--- a/src/sandbox/patchers/dynamicAppend/common.ts
+++ b/src/sandbox/patchers/dynamicAppend/common.ts
@@ -349,24 +349,25 @@ export function patchHTMLDynamicAppendPrototypeFunctions(
 
 export function rebuildCSSRules(
   styleSheetElements: HTMLStyleElement[],
-  reAppendElement: (stylesheetElement: HTMLStyleElement) => void,
+  reAppendElement: (stylesheetElement: HTMLStyleElement) => boolean,
 ) {
   styleSheetElements.forEach((stylesheetElement) => {
     // re-append the dynamic stylesheet to sub-app container
-    reAppendElement(stylesheetElement);
-
-    /*
-    get the stored css rules from styled-components generated element, and the re-insert rules for them.
-    note that we must do this after style element had been added to document, which stylesheet would be associated to the document automatically.
-    check the spec https://www.w3.org/TR/cssom-1/#associated-css-style-sheet
-     */
-    if (stylesheetElement instanceof HTMLStyleElement && isStyledComponentsLike(stylesheetElement)) {
-      const cssRules = getStyledElementCSSRules(stylesheetElement);
-      if (cssRules) {
-        // eslint-disable-next-line no-plusplus
-        for (let i = 0; i < cssRules.length; i++) {
-          const cssRule = cssRules[i];
-          (stylesheetElement.sheet as CSSStyleSheet).insertRule(cssRule.cssText);
+    const appendSuccess = reAppendElement(stylesheetElement);
+    if (appendSuccess) {
+      /*
+      get the stored css rules from styled-components generated element, and the re-insert rules for them.
+      note that we must do this after style element had been added to document, which stylesheet would be associated to the document automatically.
+      check the spec https://www.w3.org/TR/cssom-1/#associated-css-style-sheet
+       */
+      if (stylesheetElement instanceof HTMLStyleElement && isStyledComponentsLike(stylesheetElement)) {
+        const cssRules = getStyledElementCSSRules(stylesheetElement);
+        if (cssRules) {
+          // eslint-disable-next-line no-plusplus
+          for (let i = 0; i < cssRules.length; i++) {
+            const cssRule = cssRules[i];
+            (stylesheetElement.sheet as CSSStyleSheet).insertRule(cssRule.cssText);
+          }
         }
       }
     }
diff --git a/src/sandbox/patchers/dynamicAppend/forLooseSandbox.ts b/src/sandbox/patchers/dynamicAppend/forLooseSandbox.ts
index 8642d09..1274627 100644
--- a/src/sandbox/patchers/dynamicAppend/forLooseSandbox.ts
+++ b/src/sandbox/patchers/dynamicAppend/forLooseSandbox.ts
@@ -70,10 +70,16 @@ export function patchLooseSandbox(
     // the dynamic style sheet would be removed automatically while unmoutting
 
     return function rebuild() {
-      rebuildCSSRules(dynamicStyleSheetElements, (stylesheetElement) =>
-        // Using document.head.appendChild ensures that appendChild invocation can also directly use the HTMLHeadElement.prototype.appendChild method which is overwritten at mounting phase
-        document.head.appendChild.call(appWrapperGetter(), stylesheetElement),
-      );
+      rebuildCSSRules(dynamicStyleSheetElements, (stylesheetElement) => {
+        const appWrapper = appWrapperGetter();
+        if (!appWrapper.contains(stylesheetElement)) {
+          // Using document.head.appendChild ensures that appendChild invocation can also directly use the HTMLHeadElement.prototype.appendChild method which is overwritten at mounting phase
+          document.head.appendChild.call(appWrapper, stylesheetElement);
+          return true;
+        }
+
+        return false;
+      });
 
       // As the patcher will be invoked every mounting phase, we could release the cache for gc after rebuilding
       if (mounting) {
diff --git a/src/sandbox/patchers/dynamicAppend/forStrictSandbox.ts b/src/sandbox/patchers/dynamicAppend/forStrictSandbox.ts
index 407f63b..a4af062 100644
--- a/src/sandbox/patchers/dynamicAppend/forStrictSandbox.ts
+++ b/src/sandbox/patchers/dynamicAppend/forStrictSandbox.ts
@@ -94,17 +94,21 @@ export function patchStrictSandbox(
       unpatchDocumentCreate();
     }
 
-    proxyAttachContainerConfigMap.delete(proxy);
-
     recordStyledComponentsCSSRules(dynamicStyleSheetElements);
 
     // As now the sub app content all wrapped with a special id container,
     // the dynamic style sheet would be removed automatically while unmoutting
 
     return function rebuild() {
-      rebuildCSSRules(dynamicStyleSheetElements, (stylesheetElement) =>
-        rawHeadAppendChild.call(appWrapperGetter(), stylesheetElement),
-      );
+      rebuildCSSRules(dynamicStyleSheetElements, (stylesheetElement) => {
+        const appWrapper = appWrapperGetter();
+        if (!appWrapper.contains(stylesheetElement)) {
+          rawHeadAppendChild.call(appWrapper, stylesheetElement);
+          return true;
+        }
+
+        return false;
+      });
     };
   };
 }