almost all altcoins were like listed with 300% - 800% changes.
but it seems to be back to normal now. only vechain is -90%.
There is a possibility that it is only a temporary bug, I think after few hours or days the vechain will back to normal after some troubleshooting I don't see any reason for it to be hacked though but a bug is what I think happen and it is more of a possibility rather than it being hacked.