A very weird bug.
When taking a photo through Instagram for story, it gets darker as soon as you take the photo.
I couldn't find any setting or anyone with a similar problem
See an example in the attachment.
If you shoot via a third party app such as instagram, whatsapp ect... the photos take are worsd because those apps cannot have full access to the camera and cannot use the camera app post processing.
My advise is to use instagram mode in the camera, you find it in others section