Weird behavior when sending empty transactions

[idimitrov07]

When trying to send a transaction without a recipient ( a public key ) and without an amount, 1 perl + 2 more perls not shown in the payload, I guess validator reward, so total of 3 perls. goes to the main node ( the first node when creating the test test). In this case, the first node is also staking more than 2500 perls:

Beginning ledger:

{
    "71e6c9b83a7ef02bae6764991eefe53360a0a09be53887b2d3900d02c00a3858": {
        "Nonce": 122,
        "State": {
            "balance": 99977524,
            "stake": 12500
        }
    },
    "ec8bbc01d1e54294bca7ddef9b2919b2ae7739a216aad23d06dfeab4a0d83c15": {
        "Nonce": 132,
        "State": {
            "balance": 9976
        }
    }
}

Empty transaction ( meaning no recipient and no amount ) from 2nd node to first node ( staking ):

{
    "id": "1dc2816981f26e1709f1cc137fdb9c539e1042ee34e719cd80bc94c289ae2aab",
    "sender": "ec8bbc01d1e54294bca7ddef9b2919b2ae7739a216aad23d06dfeab4a0d83c15",
    "nonce": 132,
    "tag": "transfer",
    "payload": {
        "recipient": "71e6c9b83a7ef02bae6764991eefe53360a0a09be53887b2d3900d02c00a3858",
        "amount": 1
    },
    "signature": "pZ7zvpRCCVbgh6VWxLXApLFpjVr0Qg1CZ/b7Fi2HCdpt77/qw79/0uGhI5pJ9PpNezP63Unc5qj78PsWL3vbCg==",
    "parents": [
        "b7ea8d8196cf0d95dbea7dbe160a5a833ee33aba22ef169414bdcc7df503baf8"
    ]
}

Ledger now:

{
    "71e6c9b83a7ef02bae6764991eefe53360a0a09be53887b2d3900d02c00a3858": {
        "Nonce": 133,
        "State": {
            "balance": 99977527,
            "stake": 12500
        }
    },
    "ec8bbc01d1e54294bca7ddef9b2919b2ae7739a216aad23d06dfeab4a0d83c15": {
        "Nonce": 133,
        "State": {
            "balance": 9973
        }
    }
}

Also, it happens the first time making empty transaction. The second time it sends 1 perl only: Second empty transaction:

{
    "id": "af61e78c41091b69de20a1f41fac8574cb4a5046667dac78f6b8676661bffe34",
    "sender": "ec8bbc01d1e54294bca7ddef9b2919b2ae7739a216aad23d06dfeab4a0d83c15",
    "nonce": 144,
    "tag": "transfer",
    "payload": {
        "recipient": "71e6c9b83a7ef02bae6764991eefe53360a0a09be53887b2d3900d02c00a3858",
        "amount": 1
    },
    "signature": "qroM28uPoeqHb7mDUfGWbPR3g29SzlLVArdYTY1+iY6+TEXnEaaXL3NTOPbMLdt0wkS3vO/WasXsW1A7JCCuAw==",
    "parents": [
        "0985426e96a1f077683f9cf692b40811c18922090084594516dbe85ef4ca4aa6"
    ]
}

Ledger:

{
    "71e6c9b83a7ef02bae6764991eefe53360a0a09be53887b2d3900d02c00a3858": {
        "Nonce": 133,
        "State": {
            "balance": 99977528,
            "stake": 12500
        }
    },
    "ec8bbc01d1e54294bca7ddef9b2919b2ae7739a216aad23d06dfeab4a0d83c15": {
        "Nonce": 145,
        "State": {
            "balance": 9972
        }
    }
}

After making some more transaction from the staking node, the next empty transaction from the second node again sends 3 perls.