Items Dissapearing after death

So once ,my mate jumped off a really high place to kill himself,as a joke. Then ,when I ran to his stuff It was gone. Most of it Was gone and we searched the Ground under and nearby,only some things such as A few amour pieces And a Tool or two survived. Similarly,I got killed a few weeks later by my mate and respawned ,only to discover I only had 2 armour pieces,and my sword. The rest Was gone including eleytra,food ,Tools ,Bow, just like the time before. We searched the area and it was gone. This is truly irritating