k. The second time I was still trying to download the first zip for some reason.
Anyway, as suspected FCP is correct. Your appdata share is set to use Cache: YES
While this isn't a problem per se, your performance will suffer significantly, as all of the metadata, etc for any of the apps you've got installed get moved whenever possible to the array. By and large, most people have the appdata share set to be use cache:Prefer so that it stays on the cache drive and overflows if necessary to the array