Picking up weapon from player stash then disappear

[WildFX]

I picked up a weapon from a dead player and dragged it into my inventory while putting it and it showed up in my slot When closed the screen it disappeared from my inventory and was replaced back with my previous weapon (picked it, dragged it, it changed with mine, then closed and it disappeared), I searched throughout my whole inventory and in the range of the stash and everything, nothing was there, please rethink your game because it made me lose a round. My network was quite fine and I thought it maybe was a visual bug, but it was actually a game-breaking bug that can delete weapons, I don't certainly know how it was done but yeah check your game, please. The chance is that that player was a bot the the designed weapon was just a fake weapon, im not into programming and stuff so I don't know.