Incorrect disk usage reported by CDVR

I'm preparing to switch my RPi4 to Rasbian and have temporarily moved my CDVR recordings over to my M4 Mac mini.

I setup Docker Desktop and bind mount a 1TB external USB HDD to /shares/DVR in the container.

Everything seems to function just fine but I noticed that the CDVR admin page and clients are reporting incorrect disk usage.

In the docker container 'df -h' reports the correct usage:

/shares # df -h .
Filesystem Size Used Available Use% Mounted on
overlay 1006.9G 2.3G 953.3G 0% /

However, the CDVR web admin reports:

Disk
80.8% used
10.97 TB available

And clients report the same.

I've tried changing Virtual Manage Manager and file sharing options. I generally get different results in the DVR web admin, but they are still incorrect.

I don't know if this is a MacOS specific issue or a Docker issue and wondering if anyone else has had this issue and if so, is there a solution?

Thanks!

David