As far as I know bitcoin cash is a forked version of bitcoin that is done on November 13, 2017. Here is the proof https://www.coindesk.com/bitcoin-cash-hard-forks-blockchain-bid-ease-mining-difficulties/. Atleast this one is a trusted site. I suspect that this kind of movement is simpy to make bitcoin price goes down a little more to give opportunities to some investors waiting for the moment.