Can someone explain the logic of the Skype contact list order?

I have Skype contact entries such as:
pc Alex
pc Barry
pc Charles
....
ph Amy
ph Barbara
ph Cindy

Where pc indicates a computer-to-computer connection and ph indicates a
Skype-Out computer-to-telephone connection.

I would like the order in the contact list to be as shown above.
But, for some strange reason, the Skype contact list order is all jumbled
up. That is, it certainly isn't alphabetical.

What is the "logic" of the Skype contact list order?
How does one change it to be purely alphabetical (like it should be)?

Thanks in advance,
Cindy