MyCloud Dashboard Space Overview (incorrect and looking strange)

Hi,

I got a EX2 Ultra 12 TB for a few days now. When I logged into the device’s dashboard recently, I noticed, that the free space overview looks weird like this:

where it should look something like that (and it did before):

Also, the information doesn’t seem correct.
On mycloud.com I think that the calculated space is correct. It says 73% of 7.9 TB available (I have a 2 TB USB HDD attached which counts to the total space). That would be around 5.77 TB, but my dashboard says 3.82 TB free. This is wrong by almost 2TB!

Did anyone experience something similar before and has advice how to fix this?

I already tried to shut the device down and to remove the network and power source, but unfortunately it didn’t help.

Thank you!