i'd guess improper care at a very young age ..... i had a r.p.manni hatch out in an indoor enclosure , the adults were taken outside for the summer in may ........ she wasn't there when i took them out ........., she received absolutely no water , minimal light and cooler temps for at minimum may-nov , her scutes did exactly what i see on your redfoot ....she is here today and is somewhere around 20yrs old , they did remain inverted somewhat , she's the only one here that looks like that ..............