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On its second update, it made it into the index for real with a PR6. This really made no sense. I have no PR7+ links to give me a calculated PR6, and only about 30 backlinks altogether. There are only about 10 pages in the site, so it's not internally generated PR.
On the latest update, with very few changes to the backlinks, it has dropped to a PR4. Which seems about right, though I'm not too happy about it.
How could I have gotten a PR6 with about 30 backlinks under PR6? Could Google have made a mistake? Or are other factors at play?
second, try doing an allinurl:yourdomain.com
If you see a lot more than what you see when you check backlinks, it is likely, you have more links than you thought, just a lower PR than those that are shown in the backlinks (PR3 or PR4)
I've noticed this in other posts too. One guy is willing to sell his wife for a PR6, and another gets it without trying. It doesn't make sense.
There must be something else to the PR calculation beyond the PR of the linking pages and the number of links on those pages, but I don't know what. After reading part of the "new algo" thread, I realized the backlinks that were added to the top of the list on most pages have moved down as more links were added, and the ones that were added to the bottom of the list on other pages are still there, and perhaps lower links pass now less PR. Still, that might explain a drop, but not the initial PR6.