Yes, it often happens because the rest of the ICO participants are behaving like you. We all want to dump the coins we have received during the ICO as soon as possible, thereby effectively driving the price down. If you have selected the ICO carefully (selecting it based on some value criteria), no need to hurry with selling the coins. Once the others have sold their bounty tokens, the price will most likely rise, like in your case.
How can that happen when the market is in a bad condition? ico participants will sell bonuses on every token purchase in pre ico or ico period and that's what keeps the price down. I imagine the price will go down but the token price increases drastically after it's in 3 crypto markets.