Normal Market forces, like with any other coin. When the price went up, naturally a lot of people sold theirs, price starts dropping, lot more sell because they panic, etc.pp. Nothing to worry about.

Just don´t sell. The more you keep, the less are on the market, of course. Demand will rise over time, though, if people believe in this coin. So the price will rise in a few days, weeks, months. Just be patient.