Put the meaning into your own words.

The curator would not ascribe the unsigned drawing to an artist without evidence.

A campus print team noticed that one poster had emerged with a narrow stripe. Their first hypothesis was that the uploaded image contained the stripe, but the original file looked clean. The result was anomalous because the other posters from the same session had no such mark. Rather than immediately ascribe the problem to the designer, Nia asked the team to compare the files, settings, and order of printing, keeping several possible explanations open until the records could distinguish them.