My genetics

What's wrong with my body like I have some really good traits but also very terrible genetic traits at the same time I run sub 12 in 100m, deadlift 200 kgs conv, squat 145 kgs atg beltless and have a 108 inch broad jump and 32 inch vert with no sprint training only lifting. But at the same time iv been so stiff since birth i could never reach my toes even as a kid whenever ri go to a physio they are astonished by how stuff my lower body is especially hamstrings calves and ankles, hips and at the same time I struggle a lot to get lean and maintain low body fat I have those sprint numbers and jumps at 20% body fat and I'm 17 and weigh 67.85 kgs I have never been able to get lean or get normal flexibility like any normal person I see who doesn't even workout but I can easily achieve big athletic feats without struggling