fix: Update stop loss check to use open_price instead of price

src/pages/backtesting/backtesting_page.py

@@ -103,7 +103,7 @@ class DynamicStrategy(Strategy):
         if self.position and self.position.size > 0:  # Make sure we have an active position
             try:
                 # Calculate the percentage loss from entry
-                entry_price = self.position.price  # Changed from entry to price
+                entry_price = self.position.open_price  # Changed from price to open_price
                 current_loss = ((price - entry_price) / entry_price) * 100
                 
                 # If loss exceeds 7%, close the position