If you "view in store" on the PureDBcraft pack while in Resources, it leads you to the City Texture Pack.
Not sure if that helps troubleshoot or not.
We are experiencing the same thing. It is as if PureDBCraft is linked to the City Texture Pack. In fact, if you "view in store" it goes to the City Texture Pack in the store.
If you "view in store" on the PureDBcraft pack while in Resources, it leads you to the City Texture Pack.
Not sure if that helps troubleshoot or not.