Each player builds its own playback buffer and may receive a different delivery path or encoded version. Their live positions can therefore differ on the same home network. A timing difference is not automatically a fault.
Compare like with like
Use the same channel version and disable pause or replay before comparing. One screen may be showing a delayed or catch-up session while another is at its normal live position. Note how the sessions were started.
Account for player behaviour
A device may keep more media buffered to handle delivery variation. Closing and reopening a session can alter its starting position, but repeated restarts do not remove delay created before the stream reaches the home.
Use practical expectations
If a household wants closely aligned sound, avoid playing both screens audibly in the same room. Ask the provider about supported live-delay controls rather than assuming every app offers synchronised viewing.
