Hello,
sometimes I see coins on coinmarketcap which shows extreme gains,
but when I look at the exchanges, the price is much lower.
For example 6 $ on Coinmarketcap and 2 $ on an exchange.
How is that possible? Is this a bug or manipulation?
I'm thinking that there are some time needed in order to update the information about coin price, probably you have spotted the time when it was not synchronised with the exchange price.