Perhaps you had excessive rains that caused the mango to split. I've had the same experience with 'Young' mangos, but nothing excessive.
Here at my location in Miami, FL, it's been raining almost everyday for the past 2 weeks. Since I love the rain, I don't mind all these excessive downpours. Now I've gotten a taste of what it feels like from some articles I've read, where some Americans go to live in tropical S. America, but then just get the hell out of there after 2 straight months of nonstop rain.