Likely some phising. There are similar reports on Hive discords and in some telegram groups. (Try to reach out guiltyparties, i think, she was asking around about that - or at least, she knows who did.)
I don't think, they can help you, but you can ask around there. People are aware of it, and try to identify the person(s) who is doing it.
Probably you stored your keys in a file on your computer, phone or in your email, likely that's how they got it! Always print it, or write it down, keep it on another device, which is not connected to same ip, dont keep it on same devices (ip) where from you use Hive.