I was outfitting my char in the Neoconstruct with stuff as i noticed that i can'tmove anymore although weight-limig was only down to yellow numbers. So i threw away my ammo packs... and 12 Survival kits dropped. My original 12 Survival kits remained in the inventory. I picked them up again and had 24 kits. Threw them away and a Heavy Kevlar Vest dropped. I had one equipped which was still in the armor window.
So i relogged and everything was back to normal, only that my Heavy Kevlar Helmet was missing now from the inv and armor window...
Not sure on the source of the problem tho.
Either something got mixed up and i just dropped my helmet which then de-spawned or the inventory didn't get updated to the point where i purchased one...