Impossible ammount of disk usage on my main site:

Hi, good day.

I run a multisite where I have configured an "per site" disk-space limit of 512MB. As soon as I installed SnapShot Pro I didn't realized that all those snapshots were stored "also" on my server despite the fact that I configured the plugin so the snapshots were stored on Dropbox and/or Google Drive.

Eventually the main site reached (and overpassed) the storage limit and in the Dashboard I saw this warning:

http://i.imgur.com/2vF9Kyt.png

So I cleaned all the backups that were not necessary anymore in order to free some space but now my CPanel tells me:

http://i.imgur.com/PmHcKfg.png

but my site dashboard remained exactly like before.

Why is this happening?