So i've been playing a survival server with spigot 1.14.3, and only a few plugins, like tree capitator and warp, but lately the server has run into a few problems. I built a mob trap with all the requirements fot mob spawning, lit all the caves nearby and made sure mobs could pretty much only spawn there. At first it was meant to be a slime farm, so I cleared out a slime chunk, but after some testing, none of the slime chunks the seed indicated were working, so I made it a regular mob farm. Before that, i usually noted the mob cap hitting 60-70 on the regular, so at first the farm worked for a bit, but then the mob cap lowered to 10-20 all of a sudden, and lately I havent had any mobs spawning there, or pretty much anywhere else. I'm pretty sure it's not on peaceful, and I've seen a few hostile mobs here and there, but the mob spawning won't go over 25 lately and I can't seem to find a reason or a pattern for it happening. Any solutions?
Obs: I've checked and it's only happening on the mobfarm chunk, everywhere else is ok. I'm pretty sure it's dark, and it's underground so mobs are probably ok to spawn. Haven't seen anything about it anywhere else