I have the same settings as you, and it looks wrong on quick view, there, the Disk is shown as if there are things on it. But when I look directly onto the disc and into the hidden DrivePool folder, then there is nothing in it, only Folders but there are all empty.
Windows Explorer also shows that the Feeder disk is empty except a couple of MBs but I think that this is some DrivePool related stuff, because all other disk have couple of GBs on them.
So it looks like it is working, but I have to test it with real hardware, I did only test with VMs.
I would suggest that you look into your Windows Explorer and onto the feeder disk and look there if there is everything ok. I think that the Quickview is sometime not accurate.