While it’s possible your “torrenting” activity is legal and legitimate, we all know why the concept exists, and that the vast majority of torrent traffic is a vehicle for piracy and copyright violation. In my experience professionals who live on the right side of the law simply don’t spend their time developing a level of torrent savvy that would enable them to answer your question off the top of their head. So my point is, knowing the members here like I do, I don’t imagine you’ll get a lot of help with this from the forum regulars. As always, I could be wrong.
In trying to keep this legitimate… Did you expect the torrent to be a zipped file or did Folx zip it on your behalf? Zipped files are more susceptible to corruption because of what zipped folders are–compression. Compression can fail and it is highly recommended to not have a zipped folder your only location for that information/content. If you have the option to download your torrent without a zip I would go that route. Otherwise you’ll have to contact the uploader and have them re-upload to the torrent site.