Shouldn't have anything to do with iOS 9. I think it's just not backed up properly that's why it's missingI backed up before the wipe, and it automatically backs up every day anyway. This is only going till the middle of august. I've noticed some whatsapp and text messages are also missing.
Do you guys think I should try upgrading my 6S to the latest version of iOS 9 that it's asking me to, or just try a restore first?