Is it possible, that your node actually full? It calculates a free space in the allocation, not on the disk. You allocated only 9TB and 9.2TB is already used. I guess your node is full already.
But also that’s mean that the stat on the dashboard is not updated yet. Either because of errors related to a databases and/or filewalkers or our bugs.
I would recommend to restart the node with the scan enabled on startup (it’s enabled by default) and wait until all filewalkers would finish the scan without any error, including errors related to the databases.