Your smartphone's front camera may be default defined in mirror mode.
That means you can use this feature to see yourself like in a mirror... but selfies are inverted.
To get selfies in the right way, open "Camera" app  :
- switch to selfie mode, if needed ,
- tap on ,
- tap on "Settings", if needed,
- disable "Mirror": > .*

* The preview is still inverted but selfies will be in the right way.
This setting is permanent. To come back to mirror mode, do the reverse operation.