tedster - 6:47 pm on Aug 17, 2011 (gmt 0)
Whether PR is shared and how much depends on your internal links. But this situation sounds like one of three things:
1. Your internal pages have more direct backlinks than your home page
2. Your home page is showing a "toolbar penalty" because Google suspects you of selling links that pass PR
3. There's a bug in your toolbar data (and this happens a whole lot).