With what you explained here in linkage to the picture you attached, I couldn't get the actual relationship as regards what you claimed. Notwithstanding, in my experience with exchanges, I think I understand what you are trying to allege and what has happened to me with Bybit before, which explains why I stopped using the exchange. To make matters worse, my brother who also uses Bybit didn't have a similar problem when we compared it with his account.

This means that they route us through different servers and perpetrate their evils in some of these servers but not all, so that it will not cause a general issue or make their bad deeds obvious. This could be very painful and it's the reason why I am now being smarter before I press the "convert button" in any exchange. I make sure I compare the Bid and Ask prices carefully before confirming the transaction. They could use that to raise the spread to steal from their customers under the guise of technical error and market conditions/situations at that time.