That would suggest it is as @tomin suggests, a color order issue. And i tried with @Edz sample as input, this “fixes” the image: convert 936e1ea54107edee8763dbc69650c6e7c9350904.jpeg -separate +channel -swap 0,2 -combine -colorspace sRGB out.png
convert 936e1ea54107edee8763dbc69650c6e7c9350904.jpeg -separate +channel -swap 0,2 -combine -colorspace sRGB out.png