Old photo shows in camera app?

I delete this picture mouths ago and it still shows up in the camera app but when I click on it it goes away. I have a iPhone 5s

I think you are on iOS 8 or above.
What I know is that when you delete a photo, it gets saved to one folder as I think recycle bin. I don't know properly because I don't own an iPhone but I have seen it with my friends iPhone.

You have to go there to delete it.

It will be in photos.