Sub-sites are just marked as deleted

I am using the plugin "WHMCS MU Provisioning" and it has module commands. When I order the module to delete/remove/terminate the sub-site - the sub-site is marked by red background and by one word (see the screen shot).
And that all - the sub-site is not deleted - why? What does this mean?

When I delete a sub-site via WP - it is deleted immediately (with out any marks which I described above) but when use the module command - the sub-site is just marked but not deleted...

P.S.- I thought that it will be deleted by cron, but it seems to be a wrong idea. Hope you can help me.