First, this is a user-to-user forum. No one here (with VERY limited exceptions) works for Apple. So we cannot fix a bug. I suggest you send any such suggestions directly to Apple:
https://www.apple.com/feedback/
Having said that, I suggest you clarify you problem. It's somewhat confusing and I don't know how to help. On one hand you "deleted a photo from I message" but on the other hand " it is still in the info on the contact" (what does this mean) and finally you say you don't see it in attachments (so it is deleted?). Try rephrasing your problem.