I hope you know, that Windows calculates in binary measure units (base 2) but shows a wrong unit for that. So, 571 “Windows GB” is actually 571 GiB (base 2), or 613.4 GB (SI measure units, base 10). Our software uses SI measure units (base 10) on the dashboard.
However, this discrepancy is related to not updated databases on your node.
To update them you need to enable a used-space-filewalker if you disabled it (it’s enabled by default), save the config and restart the node. When all filewalkers would finish their scans for each trusted satellite, they would update the database. However, you need to make sure, that your databases are not corrupted and you do not have errors related to databases in your logs.