Try asking a mod if they’re from the same IP, that means a player is using you to profit. You might also want to make it harder for a hacker to enter by making your walls for your grinders and such 10 blocks thick on the top and bottom, and 2 blocks thick on the side (the maximum you can vclip is 10 blocks, while the max you can phase is 1 block).

Sometime’s its really easy to bypass that protection. I don’t know exactly how whoever’s doing it did it, but it’s not hard to find a crazy exploit and abuse the crap out of it *cough cough*.