Hi Dhruti,
We are having similar issues with only the Champion being sent. When looking for an answer, I found this string where Cheryl confirms there is a bug.
https://community.marketo.com/MarketoDiscussionDetail?id=90650000000Ps2nAAC
We're going to check in with Marketo support just to make sure the issues we are having relate to this bug. We were originally told it was because our emails were in a Webinar program, and it only works in email programs. However, we did have one work in the Webinar program, and the last test we sent in an Email program did NOT work.
Lauren