Well my idea for you is trying to remove plugins that could interfere with each other, some plugins you can most likely skip when trying to solve the problem are :
BetterNick, ClearLag, Essentials, EssentialsChat, EssentialsSpawn, Holograms, Reports, Super Vanish, Ultra Cosmetics, ViaBackwards, ViaRewind,ViaVersion, Worldedit, Worldguard -> I don't think those would interfere with each other, surely there are way more plugins in your list that can't affect each other but those are the ones I most likely know that DO NOT interfere.
I hope I was able to help you