You're not doing anything wrong. That's by design.
Delta angles can be 100 degrees or greater, so if you pad them with zeros, it pads them to three decimal places. There is no way to fine-tune this behavior; all you can do is either use leading zeros or don't use leading zeros.
-- Sinc
http://www.ejsurveying.com
http://www.quuxsoft.com
Sinc