Happens a lot with CP, despite selecting the option in Sab to check before download...
When you then view the source index site the nzb was snatched from, you can easily see that its incomplete... <100%.. so why is it snatched?? If information relating to the completion state of the file is visible, why cant the apps that snatch them recognise this?
Its really frustrating when youve downloaded a huge file only for it to fail when trying to repair as there arent enough blocks...