When you allow a student or group to re-submit, the group's old submission will effectively be deleted, and feedback can no longer be given to it.
The feedback given to the deleted submission is still available in the system and counts towards the number of reviews the reviewer had to complete. A small icon will show in the interface next to feedback that has been given to a deleted submission.
Feedback given to a deleted/replaced submission will not count towards the student's submission score – only feedback given to the most recent submission for that student will count towards their submission score. However, the feedback given will count towards the reviewer's feedback score.