NPC Spawn Issue: Grobb entrance guards HP

[Lazortag]

I decided for fun I was going to aoe kite Grobb's entrance guards, who are all blue/light blue to me at level 50. What I found bizarre was that one of them died while another was around 40% life still, and when that one died one of them was still at 75% or so, while the other one (which was also light blue, curiously enough) was now at 40% life. I was hitting all four of them with my Aoe's (their fat bodies make for perfect aoe kiting so I never missed one) and so there's a weird issue with their HP that I think needs to be resolved. I also think two of them should be level 50 but I'm not certain of that.

Oh, and lastly, they hit for a lot of damage for their level - something like 135 per hit. Anyways, if this is at all unclear I can try to explain better, thanks.