Delay between mutiple Helix TV boxes

Hi,

I have 6 Helix TV boxes and I noticed that there is a huge delay in the signal from one box to the other. Watching the same channel on two or more different Helix TV you notice that thay are not synced. There is a delay between them. WHY. They should all be showing the same things at the same time when watching a show, all Helix TV boxes should recieve the same signal. (No the distance to the hub does not matter I checked). Also why there is a delay when using Helix TV versus regular coax cable.

Thank you.