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In the drupal-5 version, the fieldgroup module had a higher weight in the system table. In the drupal-6 version, the update is missing.
Increasing the module weight has an big advantage, it simplifies altering fields in hook_form_alter() before they are moved into fieldgroups. Fields would always be directly accessible by their field name (e.g. $form['field_name']) instead of manually checking for fields nested in groups.
The following patch adds an update function (fieldgroup_update_6001()) which increases the module weight to 9 (as it was previously done in fieldgroup_update_4()).