Minecraft Forums

i have a survival world using Galacticraft and the power tools mod, but for some reason chucks keep disappearing so there's just a massive hole to the void. the first time this happened it got to the point that only about 10 chunks would load and whenever a mob spawned like a hundred more would spawn, and without these the game lagged like crazy. i wasn't that far so i just deleted it and started over. but its happening again and this time i have tons of stuff and have been to the moon and mars. is there anyway to fix my world?