How is it possible? are they using bots for showing fake volume??
Can anyone explain?
Hell yes those are fake volumes.

And you can see those things in many shit exchanges like Exmarkets, Coinbits, p2pb2b, Probit and more.
All bot, you only recognized it once you already dealing with this exchange, you are just trapped sending your tokens.
Sometimes i also try to sell some new coin in new exchange and that shit happen every time. People don't use those exchanges for real trade.
Mostly, those hunters and those who are into early stage of investment ends up selling coin even value is really low.
Those exchanges just for shit coins. It's better be wait sometimes if your holding good coin so don't try to trade there otherwise you'll lose all of your asset.
If you don't have any other choice and you are hurrying to liquidate those coin, it's your only option.