diff --git a/src/strategies/base.py b/src/strategies/base.py
index a54ec66..9396a3b 100644
--- a/src/strategies/base.py
+++ b/src/strategies/base.py
@@ -49,8 +49,12 @@ class StrategyType(Enum):
 
     # Complex strategies
     IRON_CONDOR = "iron_condor"
+    # BUTTERFLY is the canonical member for the iron butterfly strategy
+    # (see IronButterflyStrategy.get_strategy_type and the factory registry).
+    # A second IRON_BUTTERFLY = "butterfly" member previously aliased BUTTERFLY
+    # (identical value), so the two were the same object and collided as dict
+    # keys. Removed to eliminate the silent shadowing.
     BUTTERFLY = "butterfly"
-    IRON_BUTTERFLY = "butterfly"
 
 
 class StrategyCategory(Enum):
diff --git a/tests/models/test_scoring_engine.py b/tests/models/test_scoring_engine.py
index d9a18e9..a5041b2 100644
--- a/tests/models/test_scoring_engine.py
+++ b/tests/models/test_scoring_engine.py
@@ -28,7 +28,7 @@ def sample_probabilities(self):
             StrategyType.IRON_CONDOR: 0.35,
             StrategyType.BULL_CALL_SPREAD: 0.25,
             StrategyType.LONG_STRADDLE: 0.20,
-            StrategyType.IRON_BUTTERFLY: 0.15,
+            StrategyType.BUTTERFLY: 0.15,
             StrategyType.BEAR_PUT_SPREAD: 0.05
         }
 
@@ -66,7 +66,7 @@ def sample_risk_metrics(self):
                 'volatility': 0.35,
                 'backtest_samples': 75
             },
-            StrategyType.IRON_BUTTERFLY: {
+            StrategyType.BUTTERFLY: {
                 'max_drawdown': 0.10,
                 'var_95': 0.04,
                 'win_rate': 0.65,
@@ -95,7 +95,7 @@ def sample_expected_returns(self):
             StrategyType.IRON_CONDOR: 0.12,
             StrategyType.BULL_CALL_SPREAD: 0.15,
             StrategyType.LONG_STRADDLE: 0.20,
-            StrategyType.IRON_BUTTERFLY: 0.08,
+            StrategyType.BUTTERFLY: 0.08,
             StrategyType.BEAR_PUT_SPREAD: 0.10
         }