On Binance, more users are trading than hotbit or other. This can be a reason for the spread although I doubt. People would take advantage of that if so.
Are you in hotbit? I think there's something wrong with hotbit withdrawal. Do they allow DOGE withdrawal? If they allowed, arbitragers would try to take the advantage and the spread wouldn’t that much.
It is also possible that Doge withdrawal fee in hotbit is huge (just a guess).
I have seen some exchange doing such tricks to get the price down. But hotbit? No idea about this exchange.