[Help] Drop problem in the server

Hello,i have some problem in my server ,every time item drop coming from monster or from me by the command /item he disappeared after 5 seconds i don't know how to fix that i also allredy try the antilag patch but stil any drop in the server from anything disappeared after 5 seconds,i realy hope somebody can to help me to fix that problem thanks to the helpers.


sory on my english :(