CodersStrikeBack error only occurs when battling online

The game says I haven’t put in any inputs when crossing the 4th checkpoint on Coders Strike back. However, I only get this issue when submitting it online, and if I recreate it perfectly against the boss, it does not happen. I don’t know if I can post the code or not, please tell me. I have no clue where the error is coming from. I’m using C++