IssueTracker

You can reproduce the problem using the cheeseSquare app. https://github.com/chrisbanes/cheesesquare
Update the dependencies;

...
dependencies {
    compile 'com.android.support:design:23.2.1'
    compile 'com.android.support:cardview-v7:23.2.1'

    compile 'com.github.bumptech.glide:glide:3.6.0'
    compile 'de.hdodenhof:circleimageview:1.3.0'
}
...

Update the layout_scrollFlags in activity_detail.xml by adding enterAlways;

...
<android.support.design.widget.CollapsingToolbarLayout
        android:id="@+id/collapsing_toolbar"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_scrollFlags="scroll|enterAlwaysCollapsed|enterAlways"
        android:fitsSystemWindows="true"
        ...
...

Run the app. Scroll up and down in the detail screen. Check the toolbar.