Minecraft glitches and doesn't load properly

I've been dealing with a few issues on minecraft.

-when a player is holding a shield it goes through their head rather than holding it properly 

-Villagers are sleeping on the floor 

-shulker boxes sometimes don't load in textures at all and become invisible 

-Fire effect occurs even though there's no visible fire

-The world doesn't load in after dying and travelling through portals

-Minecart rails disappear