We'll need the actual output from a real shell, as rsync is usually fairly verbose, and that's just a mangled bit of output
.
At a very quick glance, given the vfat shenanigans, I'd guess you need to disable preserving permissions (user/group/mode). I don't recall the exact flag off the top of my head, but it's a negation of part of what -a does, IIRC.