Different user interface at ionic2

Hi, I am a newbie at ionic 2.
I have concerned that there are different user interfaces between serve user interface and real user interface at device.
I am testing the app via a command “ionic serve --lab” and it works properly via the serve command.
However when I am trying to execute the app in real device, the user interfaces are looking different.
Please look at screenshots attached.
Any suggestions will be appreciated.

Have you got something?

where you store your icon?