Where the Admiral Hipper class spent its displacement

Why was the Admiral Hipper class so heavy compared with treaty cruisers?

The ships were inefficiently arranged, with particularly costly turret machinery and practical limitations despite unimpressive armour.

A Royal Navy evaluation emphasizes how little combat value the large displacement appears to buy. The turret design is singled out as inefficient. The Atlantic bow also obstructed the forward turret in practical use. The class therefore warns that size alone does not guarantee an efficient cruiser.