Digital deformities also result from underlying biomechanical troubles including flat feet. Flat feet lead to the extrinsic foot muscles overpowering the more compact intrinsic foot muscles (which retain the toes straight) and Therefore lead to the digits to claw. They may be going for walks with their toes pointing outwards https://www.theorthopaedicandpainpractice.com/treating-foot-arch-pain-with-modern-orthopaedic-pain-management-techniques/