I just created a rather large form. When I downloaded the CSV of my first test entry, I notice that there are random characters in the Field Labels. It doesn't happen on every field. But it is there.
IE : http://cl.ly/image/1L0H3H1C3u0n & http://cl.ly/image/0Z0Z1e280c1z
The form is here: http://goo.gl/Y4r9j
Password: longbaycamp