PnL differences occur due to:

Execution factors:
- Network delay between leader and followers
- Market volatility and liquidity
- Slippage on fills
- Partial or skipped trades

Account factors:
- Different broker fees/commissions
- Account configuration differences
- Manual trades outside Copilink

To reduce discrepancies:
- Use same broker for all accounts
- Avoid manual trading on followers
- Keep NinjaTrader and Copilink updated
- Use wired internet connection
- Standardize account parameters

Note: Some variation is normal and expected in live trading.