I don't understand this:

$ curl --url http://***:***@127.0.0.1:8332 -H 'content-type: text/plain;'  --data-binary '{"jsonrpc": "1.0", "id":"curltest", "method": "getwork", "params": [] }'
{"result":{"midstate":"df92c2b8aac64fc5d15a0ff08a8950453ce9e8fb1ecfa39cb8aeaca78bae173a","data":"0000000174dae8b4ae722300d81693b97993f4a57dc7c8151b980d4a00003bfc00000000b79f998 e1df8db02f7d2ba1676e7060a57fa8a5764990629f53173f8b61d8c1f4dde5b591a44b9f2000000 0000000080000000000000000000000000000000000000000000000000000000000000000000000 0000000000080020000","hash1":"0000000000000000000000000000000000000000000000000000000000000000000000800000000 0000000000000000000000000000000000000000000010000","target":"0000000000000000000000000000000000000000000000f2b944000000000000"},"error":null,"id":"curltest"}

$ curl --url http://***.***@127.0.0.1:8332 -H 'content-type: text/plain;'  --data-binary '{"jsonrpc": "1.0", "id":"curltest", "method": "getdifficulty", "params": [] }'
{"result":244139.48158254,"error":null,"id":"curltest"}

$ echo "base=10;ibase=16;scale=8;00000000FFFF0000000000000000000000000000000000000000000000000000 / 00000000000044B9F20000000000000000000000000000000000000000000000" |bc
244112.48777433


Why I get 244112.48777433 instead of 244139.48158254 ?

Enzo