I found the bug
the previous activity (which was a splash screen), the theme was set as fullscreen. For some reason, when I called the other activity by intent, the bug described happened.
What I did:
I changed the manifest to:
android:theme="@style/Theme.AppCompat"
and added in onCreate of the SplashScreen:
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
Thanks!