Dont work spawn uniques if players online

Hello again :P

So i got this wird bugg...

When i alone and code on server it work spawn uniques.
then a friend tha help me test things log in and then from nowhere i cant spawn uniques

They stand sucess but nothing spawn -.-
if i kick him it work to spawn.
When a other player friend log in it getting same..

anyone know what the hell this is ? :P

- - - Updated - - -

P.S sometimes they spawn but dissapere like 1 sec after...

you need to reduce mobs number in your server Or disable some areas because gameserver can't handle everything at the same time ..

better say 50000 mob/pet/npc

yeah after a whilde i got help from a friend os we saw it was to much. i now now reduce the server from 11 to 10 to keep a good spawn also remove alex and so on to be able code in kinda much but keep the mobs spawn good and to make events