Ah, and two similar resolved issues wrt author, might help:

• T160845 wrong author listed and wrong first/last name for the one author listed using ISBN lookup
• T203361 Publisher is incorrectly parsed as an "author full name" and split into first and last name when generating from DOI

It looks like from these examples it's bad metadata in the source.

I had a look at the one here: view-source:https://economics.nd.edu/faculty/william-evans/

It looks like, actually, the metadata is repeated twice in that page: there's like a partial head down there at the bottom with no closing tag... The html is formed badly.

For view-source:https://www.swr.de/wissen/1000-antworten/kultur/woher-kommt-redensart-ueber-die-wupper-gehen-100.html
The metadata is like this:

<meta name="author" content="SWRWissen">
<meta property="author" content="SWRWissen">

Both of these are valid, syntax, so it reads it as two different authors...

We could just make sure to check there are no duplicates before sending it off in citoid - I've also filed a bug with Zotero to see what they think, if it should be handled by the translator: https://github.com/zotero/translators/issues/2354

Yeah, I guessed something like that from a few examples, but they had various causes.

It is not an issue of one particular translator for one specific website, but in general Zotero and/or Citoid should check the list of propagated authors, editors, publishers or whatever, whether this text is already present. If found, duplicates should be removed. Finally they may concatenated and resolved to a list of locations, authors or anything else.