Blobs not deleting properly?

view story

http://forum.xda-developers.com – My blobs folder was getting just insanely huge (i had maybe 5 backups taking up 8+GB of space, most of them very similar). I got so frustrated, I just went and deleted all the backups from Rom Manager. I then rebooted into recovery (CWM and performed a "free up space" for my nandroids. However, my blobs folder is still almost 4GB. Whats going on here? Why would there be blobs not being removed if all the backups were deleted? (HowTos)