So a few weeks ago a started a server for me and my freinds. THings were just fine, after a few weeks, however, suddenly as i was building a volcano for some plot thing, i ran a W.E command that would remove all command blocks in a certain raduis, //replacenear 100 repeating_command_block air, this should have simply removed all command blocks in that area by turnign them into air, but it changed 19k blocks. I intially thought it filled the air with command blocks, but no, at one point it loaded 2 chunks that I could see, and it was completly untouched for some reason, but now when i join no chunks load, I can still run basic commands like /kill and stuff, and type in chat, but its still very laggy. I dont know what to do, any ideas?