decodecustomtx and listaccounthistory have different information

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?

Start by tracing the `decodecustomtx`, `listvaulthistory`, and `listaccounthistory` entry points and compare how each builds its transaction result. Determine what the additional amounts represent and whether the APIs should expose consistent information or document the difference; no files or tests are named in the issue.

Written by the indexing model from the issue text.