Then it wasn't DDP incoterms. Again, with DK, it depends on the country, currency, and shipping option. Note that if you haven't ordered from DK in a while, take a look now — I know that their terms with Switzerland have changed in the past few years (for the better), for example.
Right now, it looks like DK to NL is DDP if paid in Euros, or when paid in USD but only with UPS (with FedEx or DHL it's CPT).
I ordered recently, three purchases last three months. Btw, I order as private customer, not a company. To be more specific, they ask to pay VAT on delivery. And yes, I'm confident that I select DDP option. So, their definition of "DDP" differs from that of Mouser.