Random deaths after killing somebody

[Awsomest 1]

Me and a group of three friends were looting the military tents are Stary. I was looting the first tent and heard silenced bullets near me. My friend who was watching over for people spotted him and shot and killed him. I went to loot his body and found that he had a L85A2 AWS! I got really excited. I quickly picked it up and ran to the trees where my friends were in waiting. Suddenly my second sniper randomly died. No shots fired or anything he just died. Not long after my other friend who was looting with me died lying in the tents, again no shots, just died. I quickly left the server along with the remaining friend. We changed to another server to avoid dying randomly and all the loot i got of his body was gone even the gun i had dropped to trade was gone. After a quick discussion i decided to go back to the server to loot his body. When i came back he was alive with the gun i looted and killed me. I know for a fact that he was dead because i always make sure with another shot to the head and my friend got the murder for him. We are unsure the player name who we suspect to have hacked because there's no way they killed 2 of my friends with silenced weapons. They would of heard the ticks and one of them was prone in a tent he would have seen the player that killed him. The server was Seattle 135. The player we think we killed (not 100% sure) was "Maureece Blackson". The same thing happened yesterday at the airfield were we shot and killed somebody and they cam back to life. Is this a known bug/glitch/hack?