The first thing that comes into my mind is that your laptop has some malware on it, giving to somebody else some of your data - maybe what you type or the content of your screen.
Another idea would be that the clipboard is intercepted and you've sent to hacker's address believing you are sending to your own address - this can easily be checked.

Both cases we talk about a compromised computer that has to be cleaned.
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I am using windows 10 on my laptop and I never being attacked any malware before. Even I activated windows defender and avast security too. But I believe hackers can do anything what I even can't think. Maybe you are right, They were monitoring my screen to find out any new wallet or something like that. Now, I cleaned my C drive and installed a new windows 10 from my laptop. Should I clean my every driver from my laptop or I am okay? Please kindly tell me. Thank You