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I cant remember tho, im sorry...
First, get clear lag, then if it still lags, change host, it might be its connection or its emplacement in the world.
Use NoNpcTrade, its a plugin that you can configure so all npc's including modded npc, will not have anything to trade!
Then change the plugin, if there is no update, try and find a substitute for this plugin. That way will be the easiest way to go with.
Use floauction, you can customize the limits in config, no gui, perfect for factions, prisons and more!
There is a plugin made for that, it says who banned him, why hes banned, and a custom message wich could be the website to appeal.
Add your own directory for it to run, and also, you should change build to spigot, its easier i find to use