iPhone - Various Models - Selfies Appear Backwards AS TAKEN

In the attached photo, below, we see what **should** happen:

It happens properly on my iPhone 5 and my wife's 8S.

What happens on several of my friends' iPhones(6 or later), is that the resulting photo comes out as appears in the viewfinder on the LEFT(backwards). What I want to do is find out how to fix this obvious defect.

On a properly working iPhone Camera(mine, my wife's), yes. But there seems to be a misunderstanding of what is happening on a few of my friends' devices. The TAKEN selfie, the one represented above on the right, is coming out as it appears in the VIEWFINDER(left) - BACKWARDS. By "taken" I mean AFTER the button is pressed to take the selfie.

In other words, their iPhones(and one Droid) are not performing the function of FLIPPING the TAKEN image so any words/characters appear correctly. So both selfie images above(preview on left, taken on right) appear as the one on the LEFT!

HOW else can I explain it?? Does it need to be demonstrated in person?

Any ideas?

By the way, mine and my wife's iPhones are ok. They don't take "backwards" selfies. You can read text on our shirts and in background correctly.

So, no ideas why this is happening to my friends, or how to fix it?

Me: 4(mothballed) and 5S - Selfies taken correctly(as in my above example)

Wife: 8S - Selfies taken correctly

Friends: iPhones 6-10, plus one Android - Selfies taken incorrectly - taken selfie photos appear in above example as in preview(left hand image - BACKWARDS).

Reminder: "Taken" = AFTER round red or white shutter button is pressed(represented by RIGHT hand photo in above example).

So, crickets regarding why TAKEN selfies on my friends' iPhones are not

being flipped properly(so as to be able to read their shirts correctly, or

the time on a clock behind them)?