Something weird happened

Something weird happened in one of my recent games that I'd like to tell you and see if we can explain it somehow.

I was exploring GC around lvl 3 or 4 and a goblin wearing an arcanite chain mail and Vermis showed up in the mine field. I killed him and he was wearing an amulet of life saving so I had to kill him again. I took his items and kept on exploring the level. Nothing strange here as he probably found that stuff in the floor.

I found another amulet of life saving and another Vermis, so now I had two vermis, an arcanite chain mail and an amulet of life saving. I thought it was probably due to a wand of mirroring exploding somewhere as the amulet of life saving dissapeared within some minutes and the arcanite chain mail too. Now I cannot explain how both Vermis dissapeared and didn't found any other one in the whole level. Also I did not find the real arcanite chain mail either.

At least one Vermis shouldn't have dissapeared if it had been mirrored somehow. The AoLS I found could be the mirror image and the goblin used the real one, but I can't explain what happened with both Vermis and the arcanite chain mail.

Any idea what could have happened?

Well, it is possible to find mirror chests lying on the ground, as well as mirror items within regular chests and mirror items lying on the ground.

BDR is right, but for a bunch of items to spawn in pairs is rather odd however. I'm more inclined to think that a monster who picked up the vermis and chain mail stepped on a mine that had the amulet and a mirror wand nearby. Then the goblin came along (unless it wasn't killed, in which case it can be the goblin from the start) and picked up one of each.