Non-reproducible storage space consumption

SYSTEM INFORMATION
OS type and version Ubuntu Linux 20.04.6
Webmin version 2.021
Usermin version 1.861
Virtualmin version 7.7
Theme version 20.21

I have a Server which currently have 40 GB of Storage.

The disk is nearly full.
But if I check the disk-usage on CLI, I don’t get where the disk-usage comes from.
ncdu for example, shows for dev/sda1 (which is the main-drive) that something round about 16GB are used.

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I don’t get, where the 40 GB are used. Any hint how to figure this out?

I’ve assigned now 80 GB of discspace in the cloud and change the partition-table.
After Reboot, it magically goes down to 12 GB for dev/sda1:

So it might be some strange error / issue with partitions?!

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