If existing manual orders are placed in the futures trading market, will new orders not be placed through the API?

API Futures API
1

If there’s a manual order in the futures trading market,
Is there no additional new order for the API program?

2

I do not really understand your question. Can you give an example that explains your situation?

3

https://fapi.binance.com/fapi/v1/order?symbol=BTCUSDT&side=BUY&type=MARKET&quantity=0.1&timestamp=1641538812166&recvWindow=50100&signature=b50cc6948e1161
The above order is successful in other accounts, but the order fails in certain accounts.
(Order format is wrong) Error 400.
But you can check your wallet balance. However, only orders are not sent.

In addition, other accounts can order in the form of the above order.