When all cryptocurrencies have decreased but there are some cryptocurrencies that have increased in price, this is because the crypto currency has just been listed on the crypto market or the crypto currency is currently popular.
There are also several Altcoins that are always at odds with the price in the crypto market, namely BNBHEDGE, XRPHEDGE and ETHHEDGE. The price of BNB and BNBHEDGE will always be opposite, i.e. if the price of BNB goes up, the price of BNBHEDGE will go down, as well as XRPHEDGE and ETHHEDGE.