Hello,
I can see that you don't have the mission "Shino's Cover" three-starred. Try clearing that and see if that's required to get the coupons for chapters 4, 5, and 6.

Also, can you send screenshots of the rest of your missions for chapter 5 and 6? You only showed the top half of those chapters. You're missing 9 missions in chapter 5 and 10 in chapter 6 that aren't shown.
Thanks!