So the other day I was playing skyblock with my friend and it said someone joined in chat, but when I clicked pause it still said it was just us 2 in the game so I didn’t worry about it. However I clicked pause when I was about to save and quit today and saw a random guy in the game who isn’t in our co-op. I have over 50 hours in this skyblock and don’t really want some random guy to ruin it, although I can’t seem to find him anywhere. Should I be worried? What should I do?