In NordFX company, this will not happen because of the funds to be withdrawn have been separated prior to the funds on MT4. So that transactions and withdrawals will not interfere with each other.
NordFX is a broker have the best Trader Cabinet. Balance on MT4 (for transactions) can be separated with Balance Trader Cabinet (to save or withdrawal).

All MT4 deposits and withdrawals are made automatically in real-time regime.