Source code in code block and outside code block?

I put the following sourcecode in a code block with pre-tags around it.

function SHA256(input) {
  var rawHash = Utilities.computeDigest(Utilities.DigestAlgorithm.SHA_256, input);
  var txtHash = '';
    for (j = 0; j <rawHash.length; j++) {
   var hashVal = rawHash[j];
    if (hashVal < 0)
      hashVal += 256; 
    if (hashVal.toString(16).length == 1)
      txtHash += "0";
    txtHash += hashVal.toString(16);
  }
    return txtHash;
  }

The page shows de code in the pre tags, but also one more time outside of these tags.
The whole page is looking like crap now and I have no clue what to do.

Can you have a look?
Example: http://www.envis.nl/nieuw-maak-je-adwords-campagne-effectiever-met-google-customer-match/