Milter-greylist

I've a particular case.

some hour before the arrival of the email "autowhitelisted entry expired" for 
this example.

Email from: bla@... to user1@... user2@...

When recieving the greylisting applied acl 'delayed for 15m' and to the second 
email "autowhitelisted"

Shouldnt greylist apply delay to both emails? or not delay both emails cause 
of lazyaw?

any help would be appreciated.