diff --git a/frontend/src/lib/xray/forms/fields/SniffingField.tsx b/frontend/src/lib/xray/forms/fields/SniffingField.tsx
index 45ce5ad26..5369f8d99 100644
--- a/frontend/src/lib/xray/forms/fields/SniffingField.tsx
+++ b/frontend/src/lib/xray/forms/fields/SniffingField.tsx
@@ -27,6 +27,14 @@ export default function SniffingField({ value, onChange, enableLabel }: Sniffing
     onChangeRef.current?.(sniffing);
   }, [sniffing]);
 
+  useEffect(() => {
+    if (value === undefined) return;
+    const serialized = JSON.stringify(value);
+    if (serialized === lastEmitted.current) return;
+    lastEmitted.current = serialized;
+    form.setFieldsValue({ sniffing: value });
+  }, [value, form]);
+
   return (
     <Form
       form={form}
diff --git a/frontend/src/test/sniffing-field-resync.test.tsx b/frontend/src/test/sniffing-field-resync.test.tsx
new file mode 100644
index 000000000..6dac6008d
--- /dev/null
+++ b/frontend/src/test/sniffing-field-resync.test.tsx
@@ -0,0 +1,21 @@
+import { describe, it, expect, vi } from 'vitest';
+import { render } from '@testing-library/react';
+
+import SniffingField from '@/lib/xray/forms/fields/SniffingField';
+import { SniffingSchema } from '@/schemas/primitives/sniffing';
+
+describe('SniffingField external re-sync', () => {
+  it('reflects an external value change (e.g. an advanced JSON edit) in the friendly form', () => {
+    const disabled = SniffingSchema.parse({ enabled: false });
+    const enabled = SniffingSchema.parse({ enabled: true });
+    const onChange = vi.fn();
+
+    const { rerender, getByRole } = render(
+      <SniffingField value={disabled} onChange={onChange} enableLabel="Enable" />,
+    );
+    expect(getByRole('switch').getAttribute('aria-checked')).toBe('false');
+
+    rerender(<SniffingField value={enabled} onChange={onChange} enableLabel="Enable" />);
+    expect(getByRole('switch').getAttribute('aria-checked')).toBe('true');
+  });
+});