Different amount of hits between API and search in Mediestream

[maxodsbjerg]

I am using the following query to load data for a text mining task:
støj* AND lplace:København AND py:[1850 TO 1881]

Resulting in this response-URL: http://labs.statsbiblioteket.dk/labsapi/api/aviser/export/fields?query=st%C3%B8j%2A%20AND%20lplace%3AK%C3%B8benhavn%20AND%20py%3A%5B1850%20TO%201881%5D&fields=link&fields=recordID&fields=timestamp&fields=pwa&fields=cer&fields=fulltext_org&fields=pageUUID&fields=editionUUID&fields=titleUUID&fields=editionId&fields=familyId&fields=newspaper_page&fields=newspaper_edition&fields=lplace&fields=location_name&fields=location_coordinates&max=3000&structure=header&structure=content&format=CSV

The response is 1933 hits.

As an explanatory example for my audience it would like to say that it is the same result as doing the query in Mediestream, but just presented in a different way. But here is the problem - It's not!

The exact same query in Mediestream results in 2184 hits. https://www2.statsbiblioteket.dk/mediestream/avis/search/støj*%20AND%20lplace%3AKøbenhavn%20AND%20py%3A%5B1850%20TO%201881%5D

Why is this?