Changes in file properties (e.g. if called from the Insert Field dialog) aren't reflected in the current field values, even after re-calculation.
One has to close and re-open the document to update the fileds.
I propose to directly make the changes available or to add a hint on how to get changes into effect.
The link to the property dialog in the insert Field window suggests that one can edit the properties on the fly while inserting fields. The user experience is that these changes won't affect the field values. IThe user is left with the question whether this is a bug or feature and what he is supposed to do.