When I use bitcoin-cli -testnet to generate a 2-of-3 address, the code:

bitcoin-cli -testnet createmultisig 2 '''
 [
   "03b91ff254ae3bb3861e4a6c16ab356d6c52ccfd2b58bedf0dda84657dfd9d9afc",
   "039f1475fb37d91ed65765c897acbdc37da3a7aba19f5b8ad5ff22a994e8350798", 
   "030ee8793fa2cb93f0cfd475b990cbaa48a28d83bd8f434348607368e52644febf"
 ]'''

the result is

"address": "2MzSwUwBc1xuNHwRotwrdFugLvju8VV9uPT",

But when I use bitcoinjs-lib, the code is:

var pubKeys = [
'03b91ff254ae3bb3861e4a6c16ab356d6c52ccfd2b58bedf0dda84657dfd9d9afc',
'039f1475fb37d91ed65765c897acbdc37da3a7aba19f5b8ad5ff22a994e8350798',
'030ee8793fa2cb93f0cfd475b990cbaa48a28d83bd8f434348607368e52644febf'
].map(function(hex){
return new Buffer(hex, 'hex');
});


var redeemScript = bitcoin.script.multisig.output.encode(2, pubKeys); // 2 of 3
var scriptPubkey = bitcoin.script.scriptHash.output.encode(bitcoin.crypto.hash160(redeemScript));
var address = bitcoin.address.fromOutputScript(scriptPubkey);

Now the address changed to

38tjRCFaQWQ269oGDpEkdxh5iPgxh7kvtB

How could this happen? Did I do something wrong?