Most ICO fails at the moment, I haven't invested into an ICO for a year now, I'm really surprised to see that you have been able to make any money until now.
In this market, people sell as soon as they can find somebody to buy their tokens. Also remember that ICO has a private sale, before the pre-sale and the public sale, investors in the private sale, has access to information about exchange listing before anyone else, and they also bought their tokens at a much cheaper price than the investors in the public sale, so those investors are probably still making a good profit, even if they sell much cheaper than you bought.