What is the differences of these two screen ? Same apps, different screens

In my applicationi I use min Android version as Android 4.
I tried my apps in my two mobile phone.
One is Samsung A7 2016 and the other is LeTV Leeco X620.

In the screen of X620, the pics are whole and the presenttion is great.
But the screen of the Samsung is differens, the pics are not whole.

please, help me.
Regards. İrfan.

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