decodecustomtx and listaccounthistory have different information

[sandrich]

I withdrew 50 DUSD from vault and see the following in decodecustomtx

{
  "txid": "xxx",
  "type": "WithdrawFromVault",
  "valid": true,
  "results": {
    "vaultId": "xxx",
    "to": "some-address",
    "amount": "50.00000000@15"
  }
}

When I look at listvaulthistory or listaccounthistory I see

 {
    "owner": "some-address",
    "blockHeight": xx,
    "blockHash": "xx",
    "blockTime": xx,
    "type": "WithdrawFromVault",
    "txn": 8,
    "txid": "xx",
    "amounts": [
      "16.58973533@DFI",
      "0.00002979@ETH",
      "0.00000150@BTC",
      "50.00000000@DUSD"
    ]
  }

Has this something todo with the negative interest rate with DUSD? Or what are the other amounts in there?