On my server, I created a mob farm using the design from this video -->
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Just to be sure, I tested it out on a super flat world and it worked with amazing rates. I was convinced, so I built one on my server. It didn't work and I built it exactly as I did in the super flat world. I built the farm over an ocean to help the spawn rate of the farm, but nothing. I checked F3 and it appears there are only 4 entities within the loaded chunks, none of which are mobs from the farm. So far I haven't gotten a single spawn and this is frustrating because I spent so much time and materials on this project. Help?