That is almost always the payment provider's transaction fee, not an investment loss.
FPX charges a flat fee per deposit. Direct debit deductions carry a separate fee. Both are charged by the payment network, not by Wahed, and both are flat — the same amount whether you deposit RM100 or RM10,000.
Two practical consequences:
- If you want a round amount invested, deposit slightly more to cover the fee.
- Depositing larger amounts less often costs less in total transaction fees than small frequent deposits.
If the shortfall is much larger than a typical transaction fee, that is worth raising with support rather than assuming.