Champion v Challenger testing
Hi all,
I attempted to run a Champion vs Challenger test on the subject line of emails within my batch campaign but it did not seem to work. Hoping I may be able to get some advice as to where I went wrong / how to run this correctly.
I have 'Send Email' steps within the flow of the applicable smart campaigns. Prior to sending I;
- Went to the email asset/s.
- Right clicked and selected 'New Test'
- Changed the test type to 'Subject Line'
- The 'Champion' pre-filled from the email created and approved.
- I typed an alternate subject in the 'Challenger' field.
- Set the distribution to 50% / 50%.
- The champion criteria was Open %.
- Under the 'Test Actions' drop down I approved the test.
- I also sent a sample test and got both versions emailed to me.
After the assigned week, I got the email with the results and found that all people were sent the champion and noone received the challenger. This has happened over a few emails.
Does anyone know why this would be happening?

Thank you!!