I guess the dumping of shares is related to the news about half of the shares not being sold... and the fear to a future bunch of IPO-price-shares, maybe?
Danny said those shares will be different in a couple of ways, starting from the initial dividend. So no, I don't think that's the reason at all.
People are just cashing out their profits. IPO was at 0.003, many shares were sold for much less on Havelock since someone got out because he was scared or tired or just needed the money. So we are talking about a 80% or more profit, which is great anyway short term.
the point is that only the first dividend was going to give 0.0035btc per share to compensate early investors, am I right?
No, there's no way to know how much the first dividend will be. The 0.0035 is what they promised to pay to investors before retaining any profit for themselves.