I'm using Massview Analysis https://tools.wmflabs.org/massviews/ with External link as the source. (from this table, all the links in the 3rd column)

For the external link I choose http://www.kb.nl, with nl.wikipedia.org as the platform. This gives the URL

https://tools.wmflabs.org/massviews/?platform=all-access&agent=user&source=external-link&start=2018-02-21&end=2020-02-05&project=nl.wikipedia.org&sort=views&direction=1&view=list&target=http://www.kb.nl

which outputs a list of 141 results

So far so good....

but when I return to the form and enter another query, lets say for http://www.delpher.nl, so via https://tools.wmflabs.org/massviews/?platform=all-access&agent=user&source=external-link&start=2018-02-21&end=2020-02-05&project=nl.wikipedia.org&sort=views&direction=1&view=list&target=http://www.delpher.nl

I get the exact same result page as for www.kb.nl (so same screenshot as above). It looks as if the new url (http://www.delpher.nl) is totally ignored. I observe that it seems to be serving the result page from cache, rather than actively building a new result page for the new url

I'm working with Firefox on Windows 10, and also tried using Chrome on Windows 10, but that gives me the same result. I also tried erasing browser cookies etc. but to no result as well.

Can anyone reproduce this, and point out where the problem might come from and what solutions there might be?

Also described on https://meta.wikimedia.org/wiki/Talk:Pageviews_Analysis#Massviews_Analysis_with_External_link_as_source_produces_same_result_set%2C_irrespective_of_the_external_link