Prosites Upload quota for main site

Howdy,

I've just noticed that the main site of my multisite platform has a much larger total that it should. After looking at the other sites it looks like its total is the combined sum of all sites on the multisite install.

i've tried to override the upload quota in the site settings without any luck, though this still doesn't solve the problem that its quota is the sum of all sites.

Thanks in advance
D