Yes, that's true, when that page shows, it has a page header, and that page header prints P R I O R to the group header, right?
Does the group footer fall on it's own page?
If so, use the following formula in the suppression formula for the page header:
previous({table.groupfield}) <> {table.groupfield}
Your post doesn't supply anything technical, even though you've been asked to do so, try being more thorough about your environment and requirement.
-k