Why does my Drobo 5C (5x3tb) as having 70.37tb?

For some reason all of the three Drobo 5’s I have in operation in the USA and Germany report their total available space incorrectly. Each one is connected to a different computer in their respective places (LA - iMac 27, SF - rMBP 2018, Berlin - iMac5K), and all report huge amounts of available space, when in reality they have about 12tb total capacity and maybe 3-6tb available. Drobo Dashboard reports correctly, but the macOS Finder does not.

Why does this happen, and how to fix it?

Could it be thin provisioning?