Disk Usage Exceeds Disk Capacity

Hello guys, I am so confused by the disk usage issue.

Here I use docker system df to show the amount of disk space used by the docker, and you can see that docker only uses 6.2GB disk space:

Images          1         0         6.21GB    6.21GB (100%)
Containers      0         0         0B        0B
Local Volumes   0         0         0B        0B
Build Cache     0         0         0B        0B

But when I use sudo btrfs filesystem du -s /var/lib/docker/ to show the disk usage, I get the following result:

     Total   Exclusive  Set shared  Filename
 127.16GiB    52.29MiB     5.77GiB  /var/lib/docker/

And this 127.16GB actually exceeds my disk capacity allocated for openSUSE, which is 75GB. And the result of sudo btrfs filesystem show is as follows:

Label: 'openSUSE'  uuid: bb51d104-2db0-4965-8f2a-057d8f684dab
        Total devices 1 FS bytes used 22.30GiB
        devid    1 size 75.00GiB used 30.07GiB path /dev/nvme0n1p5

Label: none  uuid: 76ba0f42-c83c-4b7a-9797-c040abbd458b
        Total devices 1 FS bytes used 15.66GiB
        devid    1 size 96.00GiB used 18.02GiB path /dev/nvme1n1p2

But my system does not crash and can be normally used. So what is going wrong here? What is actually disk usage?

As shown by Set shared. Total shows logical size and Set shared physical size.

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