diff --git a/lib/trading/position-manager.ts b/lib/trading/position-manager.ts
index 13da6b0..3885a97 100644
--- a/lib/trading/position-manager.ts
+++ b/lib/trading/position-manager.ts
@@ -1517,6 +1517,17 @@ export class PositionManager {
    * 
    * Rate limit handling: If 429 error occurs, marks trade for retry
    * instead of removing it from monitoring (prevents orphaned positions)
+   * 
+   * CRITICAL FIX (Dec 2, 2025): Atomic deduplication at function entry
+   * Bug: Multiple monitoring loops detect SL/TP condition simultaneously
+   * - All call executeExit() before any can mark position as closing
+   * - Race condition in later removeTrade() call
+   * - Each execution sends Telegram notification
+   * - P&L values compound across notifications (16 duplicates, 796x inflation)
+   * Fix: Delete from activeTrades FIRST using atomic Map.delete()
+   * - Only first caller gets wasInMap=true, others get false and return
+   * - Prevents duplicate database updates, notifications, P&L compounding
+   * - Same pattern as ghost detection fix (handleExternalClosure)
    */
   private async executeExit(
     trade: ActiveTrade,
@@ -1524,6 +1535,22 @@ export class PositionManager {
     reason: ExitResult['reason'],
     currentPrice: number
   ): Promise<void> {
+    // CRITICAL FIX (Dec 2, 2025): Atomic deduplication for full closes
+    // For partial closes (TP1), we DON'T delete yet (position still monitored for TP2)
+    // For full closes (100%), delete FIRST to prevent duplicate execution
+    if (percentToClose >= 100) {
+      const tradeId = trade.id
+      const wasInMap = this.activeTrades.delete(tradeId)
+      
+      if (!wasInMap) {
+        console.log(`⚠️ DUPLICATE EXIT PREVENTED: ${tradeId} already processing ${reason}`)
+        console.log(`   This prevents duplicate Telegram notifications with compounding P&L`)
+        return
+      }
+      
+      console.log(`🗑️ Removed ${trade.symbol} from monitoring (${reason}) - atomic deduplication applied`)
+    }
+    
     try {
       console.log(`🔴 Executing ${reason} for ${trade.symbol} (${percentToClose}%)`)
 
@@ -1646,7 +1673,12 @@ export class PositionManager {
           }
         }
         
-        await this.removeTrade(trade.id)
+        // CRITICAL: Trade already removed from activeTrades at function start (atomic delete)
+        // No need to call removeTrade() again - just stop monitoring if empty
+        if (this.activeTrades.size === 0 && this.isMonitoring) {
+          this.stopMonitoring()
+        }
+        
         console.log(`✅ Position closed | P&L: $${trade.realizedPnL.toFixed(2)} | Reason: ${reason}`)
         
         // Send Telegram notification