User Profile information not being stored on profile_values table

I have just realized about something that may not be a bug, but is a big problem for me. I think this may have started after upgrading to Drupal 5 from Drupal 4.7.

When a new user registers on the website, all profile fields required at registration time are saved only on data column on users table. This is not a problem if you access profile info on php code, since Drupal loads it properly. But it is a big problem for websites like mine where there is custom code that access directly to profile tables on DB.

I have found by editing user profiles, this information gets saved on profile_values table. But only at that time, and not before. And of course, having to edit manually every new single registered user is not an option.

Is there a way I can force profile module to save data to profile_values table when a user register?

Thank you very much.