Missing purchased Comics in My Shelf on Android App

Dear Sir or Madam,

I purchased the "Batman Day Comics Bundle" from Humble Bundle and redeemed it on Global Comix. I can see all my 30 comics on the Website using Firefox-Browser. 
When I use the Android App and I go to "My Shelf" only 26 comics are shown. The 4 Books of "No Mans Land" are mising in the "My Shelf"-area on the android App.

Best regards
Sven