Sometimes many people try to manipulate the market and buy precious tokens cheap and selling high later.They intentionally cause fear and panic in the inexperienced members and take advantage to perpetrate their greed activities.
It's not sometime, but it's often done in the market cryptocurrency. Especially with a token that has a price is still cheap so it can be done easily. This is just an opportunity, for them who has a lot of money and know of a pump and dump of a token then they will keeping up the price higher to attract the attention of some investors to merge. Just negative side if this incident be called 'cryptocurrency can be manipulated' but in fact far from it. However, this is their wrong way when it comes to market cryptocurrency.