diff --git a/src/project_x_py/order_manager/bracket_orders.py b/src/project_x_py/order_manager/bracket_orders.py
index 5126ad4..ca948d8 100644
--- a/src/project_x_py/order_manager/bracket_orders.py
+++ b/src/project_x_py/order_manager/bracket_orders.py
@@ -648,30 +648,41 @@ async def place_bracket_order(
                         target_ref.size = size
 
                 elif not is_fully_filled and filled_size == 0:
-                    # Undefined state - recheck once
+                    # Undefined state: order status can lag a real fill by seconds. One
+                    # 1s recheck raised here and left the filled position with no
+                    # stop/target, so poll a bounded window before cancelling.
+                    recheck_attempts = 6
+                    recheck_interval = 1.0
                     logger.warning(
-                        f"Entry order {entry_order_id} in undefined state. Rechecking..."
+                        f"Entry order {entry_order_id} in undefined state. Polling fill "
+                        f"status up to {recheck_attempts}x{recheck_interval:g}s before abandoning..."
                     )
-                    await asyncio.sleep(1)
-
-                    (
-                        is_fully_filled,
-                        filled_size,
-                        remaining_size,
-                    ) = await self._check_order_fill_status(entry_order_id)
+                    for _ in range(recheck_attempts):
+                        await asyncio.sleep(recheck_interval)
+                        (
+                            is_fully_filled,
+                            filled_size,
+                            remaining_size,
+                        ) = await self._check_order_fill_status(entry_order_id)
+                        if filled_size > 0:
+                            break
 
                     if filled_size == 0:
-                        # Still unfilled, cancel and abort
+                        # Still unfilled after the full poll window — genuinely no
+                        # fill; cancel and abort (the safe original behavior).
                         try:
                             await self.cancel_order(entry_order_id, account_id)
                         except Exception as cancel_error:
                             logger.error(f"Failed to cancel order: {cancel_error}")
 
                         raise ProjectXOrderError(
-                            f"Entry order {entry_order_id} failed to fill after recheck."
+                            f"Entry order {entry_order_id} failed to fill after "
+                            f"{recheck_attempts} rechecks."
                         )
                     else:
-                        # Actually partially filled
+                        # Filled (fully or partially) during the poll — size the
+                        # protective orders to the actual filled quantity so the
+                        # bracket attaches to what really filled.
                         size = filled_size
                         if stop_ref:
                             stop_ref.size = size
diff --git a/tests/order_manager/test_bracket_orders.py b/tests/order_manager/test_bracket_orders.py
index 298eed2..2a70844 100644
--- a/tests/order_manager/test_bracket_orders.py
+++ b/tests/order_manager/test_bracket_orders.py
@@ -99,6 +99,81 @@ async def test_bracket_order_success_flow(self, mock_order_manager):
         assert result.stop_order_id == 2
         assert result.target_order_id == 3
 
+    @pytest.mark.asyncio
+    async def test_bracket_undefined_state_lagging_fill_attaches_bracket(
+        self, mock_order_manager
+    ):
+        """The fill event fires but the status endpoint lags at 0 filled ('undefined
+        state'). A fill that lands on a later recheck must still get its bracket."""
+        mixin = mock_order_manager
+        mixin.place_order.side_effect = [
+            OrderPlaceResponse(
+                orderId=1, success=True, errorCode=0, errorMessage=None
+            ),  # entry
+            OrderPlaceResponse(
+                orderId=2, success=True, errorCode=0, errorMessage=None
+            ),  # stop
+            OrderPlaceResponse(
+                orderId=3, success=True, errorCode=0, errorMessage=None
+            ),  # target
+        ]
+        mixin._wait_for_order_fill.return_value = True  # event fired
+        # initial check + poll attempts: 0, 0, then the lagging fill lands on the 2nd poll
+        mixin._check_order_fill_status.side_effect = [
+            (False, 0, 1),  # initial -> undefined state
+            (False, 0, 1),  # poll 1 -> still lagging
+            (True, 1, 0),  # poll 2 -> fill confirmed
+        ]
+        with patch(
+            "project_x_py.order_manager.bracket_orders.asyncio.sleep", new=AsyncMock()
+        ):
+            result = await mixin.place_bracket_order(
+                contract_id="MNQ",
+                side=0,
+                size=1,
+                entry_type="limit",
+                entry_price=100.0,
+                stop_loss_price=95.0,
+                take_profit_price=105.0,
+            )
+        # Bracket attached — did NOT raise, protective legs placed.
+        assert result.success is True
+        assert result.entry_order_id == 1
+        assert result.stop_order_id == 2
+        assert result.target_order_id == 3
+        mixin.cancel_order.assert_not_called()  # a real fill is never cancelled
+
+    @pytest.mark.asyncio
+    async def test_bracket_undefined_state_genuinely_unfilled_still_raises(
+        self, mock_order_manager
+    ):
+        """The other half: an order that stays 0-filled across the WHOLE poll window is
+        genuinely unfilled — it must still be cancelled and raise (the safe behavior)."""
+        mixin = mock_order_manager
+        mixin.place_order.side_effect = [
+            OrderPlaceResponse(orderId=1, success=True, errorCode=0, errorMessage=None),
+            OrderPlaceResponse(orderId=2, success=True, errorCode=0, errorMessage=None),
+            OrderPlaceResponse(orderId=3, success=True, errorCode=0, errorMessage=None),
+        ]
+        mixin._wait_for_order_fill.return_value = True
+        mixin._check_order_fill_status.return_value = (False, 0, 1)  # never fills
+        with patch(
+            "project_x_py.order_manager.bracket_orders.asyncio.sleep", new=AsyncMock()
+        ):
+            with pytest.raises(
+                ProjectXOrderError, match=r"failed to fill after \d+ rechecks"
+            ):
+                await mixin.place_bracket_order(
+                    contract_id="MNQ",
+                    side=0,
+                    size=1,
+                    entry_type="limit",
+                    entry_price=100.0,
+                    stop_loss_price=95.0,
+                    take_profit_price=105.0,
+                )
+        mixin.cancel_order.assert_called()  # unfilled order IS cancelled
+
     @pytest.mark.asyncio
     async def test_bracket_order_market_entry(self, mock_order_manager):
         """Test bracket order with market entry."""