I've got a Pi with 4 Dlink DUB-H7's with 3A power supplies. Running minepeon 0.2.3a. My PI is hooked up to my lan, not wifi. From my pi, 1 usb hub is plugged. From that hub, 3 more hubs are branched out, and are filled up with 7 miners in each, 21 total. One of the hubs, all miners work. the other 2 hubs, every other miner works. I've tried unplugging them, plugging them back in, re-flashing the sd card and starting from scatch. It's always the same. One hub works 100%, and each and every other hub, every other miner mines. 3 miners mine, 4 dont, and always every other one.

Any ideas?

http://i42.tinypic.com/rrmd78.jpg