off-topic:strange behaviour of PDF file

hi, this subject is off-topic because it is not properly pertaining to Zotero, but to the behaviour of a PDF file which i want to annotate with Zotfile.

well: an article in Harvard Data Science Review ( button to download the article in PDF, i do it.

i open the article in Preview (i am on Mac) i select a passage, copy and paste it and get this string: .yteicos no tcapmi rojam a gnivah ydaerla si )IA( ecnegilletnI laicifitrA

i open the same article in Acrobat DC, and the same passage select copied and pasted gives correctly: Artificial Intelligence (AI) is already having a major impact on society.

any idea?
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