The price and, ultimately, the charts on any given exchange are determined by the price of the most recent transaction. How can the prices of 100s of cryptos all move in the same direction at the same time?
Whole thing depends on the market condition of cryptocurrencies. And If you look at bitcoin , when it's going to down then most of the currencies also turning to downing. When a cryptocurrency gets hit badly, the price of Bitcoin starts to fall, and all alt-coins around it start to fall. It because of the dominance of bitcoin in cryptocurrency world. And so now during the bearish season Bitcoin prices have fallen and all other coins have fallen in parallel.