Disk usage confusion - There are no machines or backups in use, but still PM reports disk full?

I'm looking for a little assistance with a scenario that has me completely stumped. VERY new to ProxMox and only a moderate user of the Linux system. Installed PM version 8.3.3 and started to try and create some storage. I had a couple of VMs installed and running, but kept finding that I had them located in the wrong place (I have two large external drives attached and want everything spilt between these so that the local drive partitions only get used for running PM). ProxMox has started...

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