I am making a Skywars mini game using commands and it was working just fine until me and two of my friends were doing final testing and then all the sudden my friend started dying for no apparent reason every time he would be teleported in the small player sized glass cage and the death message was "fell from a high place" and then it started randomly happening to my other friend that was logged into the world?

I am the only one with access to commands in the world and there is no kill commands in the world. for some reason it never kills me (owner of the world) even in adventure/survival. the first friend is playing on windows 10 and the second friend is playing on Minecraft for Nintendo switch. I believe I have given enough information about the bug but if you need more let me know