This is a screenshot from a Zwave plug, which has Power Meter:
If the device pluggin has got something wrong, or capabilities has been messed up, the easiest way is to remove and add the device again, as that would refresh the whole UX.
Otherwise, as you are mentioning that it happens with multiple DHs makes me thing, that a specific Capability representation has got messed up, but as I have a plug with Power meter and I don’t have any issue, it makes me feel that somehow swapping the DHs has mixed it up. You can give a try on one plug at your office, if works, then that is the solution, if not then it must be fixed by ST.
I am tagging @Brad_ST and @dckirker, they might have some idea why your metering display showss GW - GigaWatt and not W or kW.
PS.: My device uses Z-Wave Metering Switch as well.