In this exchange you can have om the order book very convenient prices, usually on the bch btc pair....
they stay there also for 10 minutes,
as soon as you try to buy, that order disappeares. This goes farther than the bot trading of other exchanges. This is a joke, is ridiculous.
It's a Chinese exchange, which is the first warning sign because China has essentially banished all of its domestic exchanges internationally.
This means that you don't know where this exchange is located and who they are regulated by, which poses huge risks in terms of you not being able to hold them responsible for their actions, at least legally as a last resort.
Anyways, it does seem weird that orders are disappearing before you actually can execute it. I don't think that it can be explained by anything other than the fact that there is some sort of inside system measure. Trying to do arbitrage on this site is completely pointless, you are putting your funds at huge risks just by storing it with them. I'd withdraw them asap.