Originally Posted by Tenhou

Just bad luck, you can get more than 1 as well :P
http://i.imgur.com/8Aex60G.png

Look at her name and you will understand why ! The legend is here !

Btw, doesn't matter how you roll the gacha, the drop rate is still the same, it's all about luck. I saved up enough gems through 3 events to make 2 11x rolls, 1st roll was 6 silvers and 4 bronzes, and this was the 2nd roll