Usage data not populating for some devices on AirVantage

I have a few GX450 gateways registered on AirVantage. Some report the “Month to Date” usage data but some do not. I cannot spot any configuration differences. Is this something controlled by the configuration or am I seeing an error?

I was experiencing something similar - but never received an official response.
My previous post:
Be nice if this were addressed or at least acknowledged whether this is/isn’t a known issue.