Exploding creeper causes server-side, but not client-side deaths to players walking away from the creeper

This also happened to another person on the server. I am playing on a server. When you are close to a creeper, and then you walk away from it, it said that you and someone else from the server were blown up and the items from both the players appear, and you can pick them up as if you and someone else were really blown up by a creeper. And you keep your inventory, so it's a duplicating glitch.

This was in survival mode.

For example, it says in chat:
Another person was blown up by Creeper
You were blown up by Creeper
But the names are there instead of another and you. All the items appear on the ground, so I can pick them up. The game thought that I blew up, but I didn't.

What I expected to happen was...:
Display no death messages, and not get any stuff back.
What actually happened was...:
It thought I was killed by a creeper, and all my stuff and someone else's were on the ground. The someone else wasn't even playing with me at that time!
Steps to Reproduce:
1. Get on a server. (I specifically used my survival server)
2. Get a Creeper, then run away right when it starts to blow up. It doesn't work most of the time.
3. Then it duplicates.