And this is how it worked:
I deposited 5K usd worth of bitcoin into Bit4X
The 5K was converted into an internal denomination called a mBTC (1000 mBTC = 1 Bitcoin)
https://bit4x.com/newsSo at the time the 5K was worth 11000 mBTC
I ended up withdrawing a little over 30000 mBTC yesterday.
The MT4 platform only allowed me to withdrawal 9999.99 mBTC per transaction, so I had to make 4 transactions.
Then, the Bit4X admin combined all four of the MT4 transactions into one Bitcoin withdrawal request, destined for my outside wallet address.