Ok, so basically me and a few of my friends were doing trial chambers and you know we died a few when we got more people and did ominous but, besides the point, after we died the mobs would pick up our stuff and we would kill them then they just wouldn't drop our stuff, so we lost some things and also every now and then the mobs would drop their armour

(This happened on a realm idk if this is of importance or not but here it is)

(This has happened to us on multiple occasions)