AGAIN: No upgrade possible

Hi, there... I did register two of my books: "PDF Explained" and "Developing with PDF". Selecting the first one in my books list did offer my an upgrade button. BUT: There is no discount given in the shopping cart.
The second book does not even offer such 'upgrade discount' button. - BUT it should!!!
Again, and again such problems occur at your page --- PLEASE try to fix this up ...
Thx,
RofaPapa
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