JS: Decryption not possible after saving to database (SJCL)

I am experimenting with a scripting library at Stanford (SJCL) and want to encrypt and later decrypt a string.

The following code works fine:

var pw = "password";
var message = "message";
var encrypted = sjcl.encrypt(pw, message);
alert(encrypted);

var decrypted = sjcl.decrypt(pw, encrypted)
alert(decrypted);

      

        
        
        
      

    

The first warning shows encrypted data and the second warning shows a "message". However, I need to store the var encrypted in the SQL database, so I send it via ajax to the server, which stores it in a table.

I later request an encrypted message (again via ajax) and store it in an encrypted variable. After that I want to decrypt it:

var decrypted = sjcl.decrypt(pw, encrypted);
alert(decrypted);

      

        
        
        
      

    

But I don't get a warning that contains the string "messages", the console only displays "uncaught exception: CORRUPT: ccm: tag does not match".

I didn't change the ciphertext, the only difference between the two examples is that I got the variable encrypted from the server.

Any ideas what is wrong?

EDIT:

The ajax code to save it to the DB:

var url = "action.php?action=r&n="+name+"&pw="+pw_hashed+"&encrypted="+encrypted;
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function()
{
    if (xmlhttp.readyState == 4 && xmlhttp.status == 200)
    {
        if(xmlhttp.responseText == "success")
        {
            alert("success");
        }
    }
}

      

        
        
        
      

    

And the ajax code to get the data:

var url = "action.php?action=l&n="+name+"&pw="+pw_hashed;
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function()
{
    if (xmlhttp.readyState == 4 && xmlhttp.status == 200)
    {
        if(xmlhttp.responseText == "success")
        {
            var encrypted = xmlhttp.responseText;;
        }
    }
}

      

        
        
        
      

    

I also compared the encrypted string immediately after encryption with the string on the server and the one on the client side (for decryption): all are the same.