Fields shown out of order on registration screen

I'm playing with bio for the first time, and added some basic fields to the Biography content type: A Name group with First Name and Last Name fields, and an Address group, with Address, City, State, and Zip fields. The Name group has a weight of -10, and the Address group has a weight of -9. Within the Name group, First Name is -10, and Last Name is -9. In the Address group, weight goes from -10 to -7 in the order listed above.

On the Biography tab on the user account edit form, the fields are displayed in groups as would be expected. However, if the "Show fields on registration" option is selected, when I go to create a new account, the fields are not in groups and are completely out of order. The order I get is:

Address
First Name
City
Last Name
State
Zip

Shouldn't the fields be in order and in groups on the registration page, too?

Thanks.