Ok, after a bit of snooping around I read that there were two problems recently - sometimes the number of items received from the inbox didn't add up correctly and some people got Jumpseed with 0% affection instead of 99%.
The compensation for the second problem was the re-send of the 99% affection girl for those who got 0%, and also the reverse, just so that everyone will fairly have a duplicate.
I've noticed no explanation for why we're getting both this time as the reward for clearing the first mission, other than the info that it was planned.