I'm Performing A/B Testing.Having 2 variant mails and 10 recipients. I specified the size of test as 40%. So the mail was sent to 4 recipients. In that 4 recipients, person who received variant B mail, have opened it. So based on highest open rate the rest 6 recipients must receive Variant B mail. But the issue is, rest of the members are getting Variant A mail only. Whenever i perform A/B testing i'm getting Variant A mail only. Can anyone explain me WHY???