I also think that the exchange administration cannot somehow interfere with trade.
Exchanges earn on listing and conducting IEO. The exchange administration does not need to interfere in bidding. In addition, it will be a blow to the reputation. I do not think that this has happened. Most likely, the user spoiled something or did something wrong.
On some exchanges, the bot interferes with trading to prevent the price of the coin from soaring or falling sharply.