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So I have built a wither skeleton with a couple of my buddies from the sever and it has turned out a big success with lots of mob spawns including wither skeletons. But recently today everything stopped and mob spawning has been to a 0. I was told that it was because other people were in the nether close to another wither skeleton farm. But i don't know why that had anything to do with my spawning rates.

IF anyone can shed light on this issue that would be very appreciated.

BTW- mob spawning has been very low all day.