EFT guns limb damage is inconsistent on NPC'S

[BadaBingBR]

I've been playing with arc9 EFT guns recently and noticed limb damage is inconsistent, doing sometimes 10, 9.9, 5 and 0 dmg max on npc arms and legs. I used arctic damage number addon to find out (Tested with everything turned off expect arccw and arc9 stuff)

I think it might have been due to recent gmod updates because before i could 1-2 shot npc's anywhere on the body (tested on gm_raid by danny judas)