Hello Iqbal and All,
To follow-up on this, my colleagues have determined why we (NCEP) are only counting about roughly half of the daily number of observations shown by DWD and JMA. It turns out that we are receiving all of them, but due to an anomaly in our downstream processing, only about half of them are making it through to the stage where they're counted for our WDQMS reporting.
This has been noted as a bug on our end and will be addressed at some point in the future, but at the moment we can't give you any estimate as to when that will be.
Best regards,
-Jeff