The console says “not reported” which means that those clients are not subscribed to that property, or they have not reported that property yet, or their report of that property was missed.
I would check client subscriptions and I would also send a Force Refresh to those clients.
@GwyndafDavies answer might help, but I don’t think it is the core of the problem here.
Also, in general I recommend using the SMBIOS inspectors to pull that data because it is more efficient and more cross platform, but @GwyndafDavies is correct that sometimes using WMI may give better results.
See Here: https://bigfix.me/analysis/details/2994751