Placement of Journal textarea by weight not consistent

The placement of the Journal field for most admin pages occurs below the submit button. An example: admin/user/access This is fine. But unfortunately this is not consistent. For example on admin/user/roles the field shows up in the middle of the page above the list of roles and above the submit button. Please see attachment.

Also I have the same problem on a CCK created content type. The effective weight of the Journal field is 0, based on the weights of the items that show up above and below it. Looking at the form with dsm($form) function in hook_form_alter gives:

[journal] => Array
        (
            [journal_location] => Array
                (
                    [#type] => hidden
                    [#value] => node/add/minutes
                )

            [journal_entry] => Array
                (
                    [#type] => textarea
                    [#title] => Journal entry
                    [#description] => If not empty, contents of this field will be logged to the system journal.
                    [#required] => 
                    [#weight] => 100
                )

        )

Any ideas? Do you see the same behavior on admin/user/roles or is it some problem with my setup?