PnL differences occur due to execution timing, slippage, broker latency, and settings variations. Common causes: - Network delay between leader and followers. - Market volatility and liquidity. - Different account configurations or broker fees. - Partial or skipped trades. - Manual trades outside Copilink. To reduce discrepancies: - Standardize account parameters. - Use brokers with similar execution profiles. - Avoid manual trading on followers. - Keep NinjaTrader and Copilink updated.