I have also been through those wallet balances and compared them to the amount sold on coingateway:
Apex (APEX): AeBeaFvNbYPLKmUnZZyxoqSGzFL6uh9AUA
Balance: 325,608.09364232
Exchanged: 351,119.739
Difference: -25,511.64535768 APEX
BitSwift (SWIFT): bYMstRCJ7YCUqhm5A5Q9wvyNRYyL1RugSd
Balance: 191,963.70558638
Exchanged: 182,615.1011
Difference: +9,348.60448638 SWIFT
Fibre (FIBRE): FQ8KQJio7ncdMDKYDaBH4eV1bQaWP1ufAF
Balance: 26,262.23414526
Exchanged: 22,581.9797
Difference: +3,680.25444526 FIBRE
LibrexCoin (LXC): DSJZAgkYxsFoU7UdUtLxHVddg5NVvctCe7
Balance: 68,918.36344923
Exchanged: 48,484.9313
Difference: +20,433.43214923 LXC
StealthCoin (XST): SLcP3vckWKkZYdUuYw46b9vAXvWZ3xvsM9
Balance: 1,244,874.457323
Exchanged: 1,604,616
Difference: -359,741.542677 XST
UtilityCoin (UTIL): UaiwbBREPphtqNB832gVpLy4B5AFwwuBFX
Balance: 60,417.15863445
Exchanged: 55,974.39
Difference: +4,442.76863445 UTIL
XCurrency (XC): XXVTS3279gzC5kagTCrEe4x5R7urnm6h2b
Balance: 340,473.460578
Exchanged: 294,647.2546
Difference: +45,826.205978 XC
Sonic (SSD): (Still on exchange due to wallet sync issue)
Balance: ?
Exchanged: 960,198.4854
There's obviously been some staking on those wallets but some of those differences are quite large.
The orders that were processed manually because of technical problems are not shown in the orders history at coingateway.net.
That makes the difference.
I know that because I checked after one of my orders was processed manually.