AWS Rekognition moderation labels issue

We have detected a small issue with moderation labels, We are running some images through the rekognition service, We tested it with some images of guns, we have found that close up images of guns does not trigger the moderation labels response. It will only trigger when we lower the minimum confidence to less than 4, which is unfortunately too low for us to run in production. One of the images we have been using is hosted on S3 and can be found at: https://dl-demo.s3.eu-west-2.amazonaws.com/messages/message_87.jpg

Can AWS Include such images in their training sets?