First thing: they are hacked for sure, not probably.
Probably, although it seems that were hacked. Just to be correct. Nothing official yet.
Second thing, especially for newbies entering crypto: it is not recommended to leave coins at an exchange. Run your own NIX wallet, ghost them in the buildin ghost vault, stake them
or lease them with zero risk to a masternode owner. You will find everything in the improved NIX wallet software.
Lease them to masternode owner?