Crypto JS: TripleDES not encrypting properly

When using crypto js tripleDES to encrypt, I noticed that all strings to encrypt which are of small length e.g "01", "111", "20" encrypt properly but with long strings like "5000021234567890000", the output isn't correct or is not the value I am expecting. For example for this "5000021234567890000", I am expecting this: "HctDaKc/U9avOwZMSS5mEi62kfojDHA4" but I get this instead: HctDaKc/U9bNnFy6eZHqHj3SemorJxQM.

This is the code I found and using to encrypt

let key = CryptoJS.MD5(enckey);
key.words[4] = key.words[0];
key.words[5] = key.words[1];
let iv = CryptoJS.lib.WordArray.create(64/8);
CryptoJS.TripleDES.encrypt("5000021234567890000", key, {iv: iv2});

Your help would be very much appreciated.

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