When joined on a multiplayer world It’s glitchy for the person that joins

My partner and I have a world together and Everytime I join I lag and if I walk up a hill he will say it looks like I’m floating. And when I mine anything it doesn’t let me pick it up.

We ended up deleting the world cause I couldn’t do anything

It happened on my iPhone,my iPad and my switch cause I thought they needed updating but they are all up to date