During a routine quality check we identified anomalies in the source's reporting. In a direct communication, the source confirmed:

Your observation is correct. The table contains small errors. Statistics Netherlands has already found these errors. Revised tables on government finance statistics will be published on Thursday 27 September.

Note that the revisions result in slightly amended government debt data in 16.1-16.3 and 17.1-17.3.

On 27 September, the source corrected the errors (citation):

Door een onnauwkeurigheid in het verwerkingsproces zijn enkele kleine fouten ontstaan in overheidsschuld (EMU), de mutatie van de overheidsschuld en de transacties in financiële activa. De fouten, in de kwartalen van 2016 en 2017 en het tweede kwartaal van 2018, zijn hersteld.

That is:

Due to an inaccuracy in the processing process, a few small errors occurred in government debt (EMU), the change in government debt and the transactions in financial assets. The errors, in the quarters of 2016 and 2017 and the second quarter of 2018, have been restored.

In response, we have synchronized Data Buffet.

The impacted series reside in the historical catalog (Netherlands » Government » Government Finance » Quarterly, from 1999) and are:

• GVLGGVDUQ.INLD = Government finance: General government - Debt [EMU], (Mil. EUR, NSA)
• GVLCGVDUQ.INLD = Central government - Debt [EMU]
• GVLGFFAUQ.INLD = General government - Change in debt [EMU] - Transactions in financial assets
• GVLCFFAUQ.INLD = Central government - Change in debt [EMU] - Transactions in financial assets
• GVLGCHDUQ.INLD = General government - Change in debt [EMU] - Total
• GVLCCHDUQ.INLD = Central government - Change in debt [EMU] - Total

Because catalog locations are subject to change, the upper-right search box on DataBuffet.com provides a "find in catalog" mode that accepts a mnemonic.

Updates

• 26 Sep - Initial version.
• 27 Sep - Corrections issued for six series.