in my spigot server there is a big problem. players can pvp in every world as normal, however once a player reaches half a heart they become unkillable. they lose all items in their inventory as if they had died but there is no "You Died" screen and they player can continue to roam around as if they are still alive. no death message appears in chat and it looks normal to every other player. again this happens in ALL worlds and all the worlds have Pvp enabled. and there is no plugin that is causing this being as i disabled nearly all of them and the problem doesnt go away. PLEASE HELP!