diff --git a/web/src/components/dynamic-form.tsx b/web/src/components/dynamic-form.tsx
index 1930ef631a..1a41c9a23a 100644
--- a/web/src/components/dynamic-form.tsx
+++ b/web/src/components/dynamic-form.tsx
@@ -115,6 +115,24 @@ interface DynamicFormProps<T extends FieldValues> {
   //   updatedField: Partial<FormFieldConfig>,
   // ) => void;
   labelClassName?: string;
+  /**
+   * Options forwarded to `form.reset()` when `defaultValues` change.
+   * Pass `{ keepDirtyValues: true }` to preserve user edits during
+   * background refetches / lazy detail loads. Defaults to `{}`
+   * (hard reset) to preserve the original behavior for existing
+   * consumers.
+   */
+  resetOptions?: {
+    keepValues?: boolean;
+    keepDefaultValues?: boolean;
+    keepErrors?: boolean;
+    keepDirty?: boolean;
+    keepDirtyValues?: boolean;
+    keepIsSubmitted?: boolean;
+    keepTouched?: boolean;
+    keepIsValid?: boolean;
+    keepSubmitCount?: boolean;
+  };
 }
 
 // Form ref interface
@@ -643,6 +661,7 @@ const DynamicForm = {
         defaultValues: formDefaultValues = {} as DefaultValues<T>,
         // onFieldUpdate,
         labelClassName,
+        resetOptions,
       }: DynamicFormProps<T>,
       ref: React.Ref<any>,
     ) => {
@@ -876,12 +895,15 @@ const DynamicForm = {
       (form as any).filterActiveValues = filterActiveValues;
       useEffect(() => {
         if (formDefaultValues && Object.keys(formDefaultValues).length > 0) {
-          form.reset({
-            ...generateDefaultValues(fields),
-            ...formDefaultValues,
-          });
+          form.reset(
+            {
+              ...generateDefaultValues(fields),
+              ...formDefaultValues,
+            },
+            resetOptions,
+          );
         }
-      }, [form, formDefaultValues, fields]);
+      }, [form, formDefaultValues, fields, resetOptions]);
 
       // Submit handler
       //   const handleSubmit = form.handleSubmit(onSubmit);
diff --git a/web/src/pages/user-setting/setting-model/instance-card/components/draft-mode-card.tsx b/web/src/pages/user-setting/setting-model/instance-card/components/draft-mode-card.tsx
index 5ad71ffbda..61518bbab4 100644
--- a/web/src/pages/user-setting/setting-model/instance-card/components/draft-mode-card.tsx
+++ b/web/src/pages/user-setting/setting-model/instance-card/components/draft-mode-card.tsx
@@ -73,6 +73,7 @@ export function DraftModeCard({
         onSubmit={() => undefined}
         defaultValues={formDefaultValues}
         labelClassName="font-normal"
+        resetOptions={{ keepDirtyValues: true }}
       />
 
       {providerName === LLMFactory.AIMLAPI && (
diff --git a/web/src/pages/user-setting/setting-model/instance-card/components/saved-mode-card.tsx b/web/src/pages/user-setting/setting-model/instance-card/components/saved-mode-card.tsx
index 12b02de7f2..01eee4efc4 100644
--- a/web/src/pages/user-setting/setting-model/instance-card/components/saved-mode-card.tsx
+++ b/web/src/pages/user-setting/setting-model/instance-card/components/saved-mode-card.tsx
@@ -190,12 +190,13 @@ export function SavedModeCard({
       <CollapsibleContent forceMount className="data-[state=closed]:hidden">
         <div className="pb-4 flex flex-col gap-4">
           <DynamicForm.Root
-            key={`${providerName}-${instanceName}-false-${instanceDetailsLoaded ? 'loaded' : 'pending'}`}
+            key={`${providerName}-${instanceName}-false`}
             ref={formRef as RefObject<DynamicFormRef>}
             fields={formFields}
             onSubmit={() => undefined}
             defaultValues={formDefaultValues}
             labelClassName="font-normal"
+            resetOptions={{ keepDirtyValues: true }}
           />
 
           <div className="pt-3">
diff --git a/web/src/pages/user-setting/setting-model/layout/system-setting.tsx b/web/src/pages/user-setting/setting-model/layout/system-setting.tsx
index 11585aa817..b792cdf3ec 100644
--- a/web/src/pages/user-setting/setting-model/layout/system-setting.tsx
+++ b/web/src/pages/user-setting/setting-model/layout/system-setting.tsx
@@ -92,7 +92,6 @@ function SystemSetting() {
     async (field: string, value: string) => {
       const modelType = FieldToModelType[field];
       if (!modelType) return;
-      if (!value) return;
       const parsed = parseModelValue(value);
       if (parsed) {
         await setDefaultModel({ ...parsed, model_type: modelType });