Discrepancy between storage used percentage and ceph total usage percentage

[Kenzi]

Hi,

I have a proxmox cluster with 9 nodes all running ceph, about 22tb of raw storage. There is one main pool using 99% of the space. In the storage page for pool in proxmox it says its using 39%, but in the ceph page it says 29%. Is there any reason for this difference?

Thanks