I have just been testing the zoom. On startup, mine does not change from the flash's last-used setting. The change occurs on half-shutter, as the Auto setting requires a check on the lens setting a moment before shutter-open.
"proper" settings - Zoom: Auto or Zoom: M24 etc? After half-shutter as a setup action, do the flash displays conform to FCM setting? Does the EXIF data on the subsequent first shot reveal conformance with the FCM Zoom setting? Is it after the shot that the flash displays something different? If so, I would expect that there is a flakey connection on one of the pins.
The King enforces compliance with the FCM's zoom setting. And it seems to default to Auto at unexpected times. The only way to get varying zoom settings is by configuring to avoid the full Canon communications - pc-sync cord, or a non-ETTL device on the RX shoe. The 550EX had its compatibility removed (inexplicable), and will hold its on-flash settings even when mounted on the King RX. A third option is to use Opas as a non-ETTL receiver with an ETTL flash on-shoe.
The metres/feet setting is solely a display option on-flash, and affects nothing in a shot. The Kings are intended to give camera control - what is displayed on the flashes is irrelevant, and too distant to be of use. I would not expect Pixel to change this, or the modelling light either. They have been well aware of the latter failure since May 2011.
By the way, I take it that you are using a Canon lens wich transmits its stop setting. Could its internal contacts be faulty?