I believe that the transaction history is wrong (it is known to be buggy), and that your actual balance includes the funds that seem to be missing.
Can you confirm if that is or is not the case?
>>> blockchain_list_address_balances BTSKaTSAwJMqF7dBDvStKmc9HZzNrg3RaGDe
[[
"BTSC5kTcnNTvTY1EQBpS3G5TSgC6fYxEXHJP",{
"condition": {
"asset_id": 0,
"slate_id": 0,
"type": "withdraw_signature_type",
"data": {
"owner": "BTSKaTSAwJMqF7dBDvStKmc9HZzNrg3RaGDe",
"memo": null
}
},
"balance": 1657031250,
"restricted_owner": null,
"snapshot_info": null,
"deposit_date": "2015-03-30T19:54:20",
"last_update": "2015-03-30T19:54:20",
"meta_data": null
}
]
]