I sent a video I had made with Premiere Elements that was 18.9 GB to the recycle bin and when I ran the cleaner to clean it I knew it would take a while to clean but I was watching Defraggler and my hard disk that was used went from 39.1GB all the way to 450.7GB which is 100% full, as it was cleaning I was watching it go up and up so I thought it would go back to normal after it was done but when I came back the HD was full and I could do nothing about it. After some messing around with another video file, I deleted it and checked Defraggler before I ran CCleaner and bam the HD was back to normal so I restored the video file that I deleted and all is good now.
I have never seen this before with CCleaner, it took my recycle bin video file that was only 18.9GB and made it over 410GB in size.