I do not actually know what make price fall after listing, but I think this happened at first of sight when the bounty hunters are dropping heavily
if there are no trading volumes from the coin, anyone can pour coins into the bottom - like a pampa coin. here 2 factors of the fall
1) bear market and everyone is trying to keep in bitcoin
2) the investors themselves, who bought closed-end sales at a very low price, are merging more. and they do not take risks for hold and sell them immediately. If a coin has a good volume of trades hunters do not