Cannot Delete Old Backup Files From Online Storage

Hello. I'm running v.5.1.0.29. I am trying to delete an old backup set that's just over a GB in size. I went into 360 > Backup > Manage Sets > Where > Online Storage > Delete Backep Up Files. I found the set, chose all files and began deleting, however there was one file I noticed I should check first and so canceled the process. Now when I go back into the set it doesn't list any files, even though my Online Storage still shows a GB being used. I even logged in to nobu.backup.com but it doesn't show anything under the Home tab (using IE9), just shows 1GB being used. Does anyone have any idea how I can free that 1GB up again?