I do not know why i always have this problem with android only. When you go through some pages of the app the problem comes.
Here is the pictures:
![Normal behavior](http://pik.vn/20150734060b-5eb5-4024-94df-863068cd196f.png "Normal behavior")
![Bug behavior](http://pik.vn/2015a5a87840-656a-45a6-9cff-957ca499308f.png "Bug behavior")