RE-arranging USB Hubs is tricky

I was trying to rearrange my USB Hubs so that I get rid of all UDB 1.1 hubs and use only USB 2.0 Hub. During the process, I found out that some hubs can't plug in certain place, or it will affect the other hubs. I couldn't figure out the exact reason, by at least I find the right set up to get thing running.