personally, I don't think your Page Rank is forged, it just looks suspicious because you rebuilt your site recently, but I think it is legit
the thing is, you may be in the process of losing some pagerank, hard to say for sure, maybe you recently lost a good backlink or links, but as it is now the PR seems legit to me
one thing to keep in mind is that the PR google is reporting now is just a snapshot of an earlier day, and may be changing since, which will reflect in the next "PR update" by google which seems to happen every few months
you will likely have knowledgable people suspicious of doing linktrades with your site until google catches up in the next pr update, just because of the way it looks now, but don't panic, just continue doing what you are doing and give google some time
unfortunately things like your site crash can be a real bitch with google, as google is all about "trust" and doesn't like drastic changes to entire site structures, but like I said don't panic, just keep working on it and google will come around
good luck with it
