This is clearly a desync issue between the server and the client. This could be caused by a lag spike, usually in domestic networks. There’s a packets loss and domino effect happens.
A reload of the viewer is enough to put it back in sync, that’s the good news.
It happens with high-speed broadband and high-speed full fibre.
It happens with 2.5g, 5g and 6g wifi or 100mb and 1gb lan connections.
It happens on 4-core processor and 8-core processor computers.
It happens on 2gb and 32gb ram computers.