Sometimes it's genetic and sometimes it's due to a high temperature in the incubator. If it's the high temperature, then your tortoise is female. If it's genetic, could be either male or female. There's nothing wrong with it and it's purely cosmetic.
AWWW what a cute tortoise I'm pretty sure that water dish is not a good/safe dish to use for your tortoise as what I'm seeing from the picture. I would definitely recommend as many others would agree, a terra cotta saucer type water dish for your tortoise. Your tortoise can climb up & flip on its back, that's why those are not safe