Incorrect XXXX-ing of credit card number

I have modified files way beyond my level of competence and now I don't know where to go to repair this. I (mostly) like the way things look here, but now the last digits of the credit card number are showing incorrectly on the confirmation screen when they are XXXX-ed.

The site is here:
www.mirocellars.com/index.php/wine-shop.html

Could you post the code handling the XXXing of the CC number you have ? You can also revert your changes in the files as there is a delete customization icon on the views files listing in Display->Views.
The view file handling that part is the file payment of the view checkout.

You should have something like that:
echo str_repeat("X", strlen($cc_number)-4) . substr($cc_number,strlen($cc_number)-5);

Oh good, delete customization. I didn't see that.

This is the closest I can find to what you wrote

<?php echo "XXXXXXXXXXX" . substr($cc_number,strlen($cc_number)-5,4);?>

Yes. Change it to what I wrote (with the php tags).

Yes, that works beautifully. Thanks!