Hi i have noticed that there is an issue for order just fields with the default fields of the core while registering a new user. but for example im using the Field Group module

How can we order for example like this

profile1 register form:
-group field1 profile1
-default core fields (also inside a group field)
-group field2 profile1

Well i tried using a hook form alter for change the weight attribute, but it does not work, i can see a weight in the UI of the profile2 but it seems that does not work with the default core fields

Any idea?