Trouble with my HP event.

[Bellos]

Its spawning the 2 the first round like it should. Then at 60% it spawns the first and and the next 2, then at the last 40% it spawns all of em, the first 2 mobs the 2nd 2 mobs and the 3rd 2 mobs.

I dunno why its doing this. Can anyone help me out?

#Grond Lieutant of Sauron
sub EVENT_SPAWN {
	quest::setnexthpevent(80);
}

sub EVENT_HP {
	if($hpevent = 80)
	{
	quest::setnexthpevent(60);
	quest::shout("Come Servants of Sauron!!");
	quest::shout("Destroy the Intruders!!");
	quest::spawn2(999240,0,0,441,764,9.6,20.9);
	quest::spawn2(999240,0,0,491.2,767.6,9.6,230);
	}
	
	if($hpevent = 60)
	{
	quest::setnexthpevent(40);
	quest::shout("Come Servants of Sauron!!");
	quest::shout("Destroy the Intruders!!");
	quest::spawn2(999239,0,0,441,764,9.6,20.9);
	quest::spawn2(999239,0,0,491.2,767.6,9.6,230);
	}
	
	if($hpevent <= 40)
	{
	quest::shout("Come Servants of Sauron!!");
	quest::shout("Destroy the Intruders!!");
	quest::spawn2(999243,0,0,441,764,9.6,20.9);
	quest::spawn2(999243,0,0,491.2,767.6,9.6,230);
	}
}