After BCH split up into BCHABC and BCHSV, the same address was used for deposits and withdrawals of each new coin at HitBTC: the "bitcoincash:" format.
On February 4, 2020, the developers of BSV network have implemented a hard fork. Please see the official announcement.
Under the new terms and conditions, the addresses of "bitcoincash:" format are no longer used for BSV transactions. From now on, HitBTC platform will no longer support BSV withdrawals to this kind of address. BSV coins should be sent to the addresses in the Legacy format: starting with "1" or "3".
BSV deposit addresses for HitBTC users are now also generated in the Legacy format. Old addresses are still valid and operational, but it is highly recommended to generate a new address in your Account section and use it for all future deposits.