You can apply a different header for first page of the document by selecting page 1 in story and then apply header you want for first page only from " Production -> Insert header... " selecting "Insert a different header on first page of the document".
But when your document has a title page it is treated as the first page of the document. We have a bug for that and our development team is looking into it.
I will update you whenever the fix for this bug will be available in our release.
Ayushi - Story Team