Hi,
I think the issue lies in the original redirect
If you notice the 404 URLS all have the ending extension, then additional items, there would probably be no space here, as this was probably from a previous domain level 301
Also for ones like
redirect 301 "/ 20Sponsored" http://www.mysite.com/ quotations are not necessary, as there appears to be no space.
It is really hard for me to give you specifics - can you PM me a specific URL string that is 404'ing then I will send you the correct 301 expression and we can check that way?
