fix update product

src/pages/products/components/Step1Form.tsx

@@ -1,4 +1,4 @@
-import { type FC, useState, useMemo, useEffect } from 'react';
+import { type FC, useState, useMemo, useEffect, useRef } from 'react';
 import Button from '../../../components/Button';
 import Input from '../../../components/Input';
 import Select from '../../../components/Select';
@@ -48,8 +48,17 @@ const Step1Form: FC<Step1FormProps> = ({ onSubmit, brands, categories, loading,
         isFake: false
     });
 
+    const isInitializedRef = useRef(false);
+
     useEffect(() => {
-        if (initialData) {
+        if (!initialData || isInitializedRef.current) return;
+
+        const hasRealData = Object.values(initialData).some(
+            (value) => value !== undefined && value !== ''
+        );
+
+        if (hasRealData) {
+            isInitializedRef.current = true;
             setFormData(prev => ({ ...prev, ...initialData }));
         }
     }, [initialData]);