I've just tested this on my phobe and the photo remains in landscape when in the Samsung Gallery @Allysisa
Maybe double check all your relevant settings and if necessary go into Settings > Apps > Gallery > Storage > Clear Cache which may help.
Daily Driver > Samsung Galaxy s²³ Ultra 512Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help. " This is the way. "
