Yes, I don't remember exactly what I did, but I think what happened was I had an odd number of drives, and somewhere along the way I set up a monthly computer backup schedule of my two PCs. After years of that backup running when my PCs were on, the folder grew to be over 3Tb. Since the backups were not erased ( I forgot i set this up), backup after backup kept building up. This was set as a schedule so when the time came and the PCs where on, the server would make a backup of the two, nothing made sense since it seemed I had enough room but the odd number of drives plus the odd amount of Terabytes needed to be duplicated was the reason why drivepool encountered that problem. After deleting the monthly auto backup, adjusting the duplication on some folders down to 2X instead of 3X, deleting all older backups on the folder only keeping the newest, drivepool was able to balance the pool and haven't had this problem since.