Why is Deduplication Store created on "localhost"?

After having created my first Deduplication Store in Data Protector 24.4 I noticed that the GUI displays the device in "Device & Media" context "Devices by host" as being connected to "localhost".

And within "localhost" there is the actual host where the deduplication device (gateways plus store) is located.

Is this a bug? I fail to understand it.