Why does Zotero add Script Javascript files in my document folder and why does is doubled pdf I had?

Good evening,

I am in a Zotero group with a friend of mine and he is having the following problem. As he was adding documents (and I was on my side as well)he noticed that hundreds of Script Javascript files had appeared on his computer and that any pdf he adds from our join dropbox folder was copied in the document folder as well? My Zotero does not seems to do any of this. How can he fix this?
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