Multiplayer Position Issue

Basically, whenever I go to popular servers, usually Survival Games servers, I would spawn in the world, and I would set off with a friend. However multiple issues happened involving my movement.

I spawned in the lobby, and everything was fine. My friend and I would look for an open game to play in. Once one opened up, we dived in and made a strategy.

That's when the bug comes in. I will move over to my friend to help him raid the chests, but I cannot open the chests. I tell my friend this and he says, that although on my screen I am right next to him, my entity is still locked in place from where I spawned on his screen! I try to hit other players, I try leaving and rejoining the servers, but this continues to happen, no matter how many times I have updated and redownloaded my client.

I am sorry to tell you that I have never heard of any other person suffering from this bug, so I fear it cannot be reproduced. It may be my computer, but I'm not sure. If you have heard of this error before and know what is wrong, I request instructions on how to fix my problem.