XAML rendering on iOS (ListView) (resolved)

We've implemented an app for Android and iOS.
Works fine on Android, but has issues on iOS.
Seems to be XAML related.

Any suggestions would be appreciated.

Attaching screenshots & code:

<?xml version="1.0" encoding="UTF-8"?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    x:Class="ListDemo.MainContent" Title="My List Demo">
    <ContentPage.Content>
        <StackLayout>
            <Label Text="My Phone Calls"></Label>
            <Grid HorizontalOptions="FillAndExpand" ColumnSpacing="2">
                <Grid.RowDefinitions>
                    <RowDefinition Height="*"></RowDefinition>
                </Grid.RowDefinitions>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="*"></ColumnDefinition>
                    <ColumnDefinition Width="*"></ColumnDefinition>
                    <ColumnDefinition Width="*"></ColumnDefinition>
                </Grid.ColumnDefinitions>
                <Picker Grid.Row="0" Grid.Column="0" x:Name="DateRangePicker"/>
                <Picker Grid.Row="0" Grid.Column="1" x:Name="DataSourcePicker"/>
                <Picker Grid.Row="0" Grid.Column="2" x:Name="CallDirPicker"/>
            </Grid>
            <ListView x:Name="SampleList" HasUnevenRows="true" ItemTapped="OnItemTapped">
                <ListView.ItemTemplate>
                    <DataTemplate>
                        <ViewCell>
                            <ViewCell.View>
                                <Grid HorizontalOptions="FillAndExpand" ColumnSpacing="0">
                                    <Grid.RowDefinitions>
                                        <RowDefinition></RowDefinition>
                                        <RowDefinition Height="2"></RowDefinition>
                                    </Grid.RowDefinitions>
                                    <Grid.ColumnDefinitions>
                                        <ColumnDefinition></ColumnDefinition>
                                    </Grid.ColumnDefinitions>
                                    <Grid HorizontalOptions="FillAndExpand" Grid.Row="0" Grid.Column="0">
                                        <Grid.RowDefinitions>
                                            <RowDefinition Height="*"></RowDefinition>
                                        </Grid.RowDefinitions>
                                        <Grid.ColumnDefinitions>
                                            <ColumnDefinition Width="74"></ColumnDefinition>
                                            <ColumnDefinition Width="*"></ColumnDefinition>
                                        </Grid.ColumnDefinitions>
                                        <Button x:Name="DialerButton" Grid.Row="0" Grid.Column="0" MinimumWidthRequest="72" MinimumHeightRequest="72"
                                            HorizontalOptions="Center" VerticalOptions="Start" Image="{Binding DataSourceImagePath}"
                                            BackgroundColor="Transparent" CommandParameter="{Binding .}" Clicked="OnDialerClicked"></Button>
                                        <StackLayout Orientation="Vertical" Grid.Row="0" Grid.Column="1">
                                            <Label Text="{Binding ContactName}" FontSize="25"></Label>
                                            <Label Text="{Binding FormattedPhoneNumber}" IsVisible="{Binding PhoneNumber_IsVisible}" FontSize="16"></Label>
                                            <StackLayout Orientation="Horizontal">
                                                <Image Source="{Binding CallTypeImagePath}"/>
                                                <Label Text="{Binding CallDate,StringFormat='{0:MM/dd/yyyy h:mm:ss tt}'}" FontSize="16"></Label>
                                            </StackLayout>
                                        </StackLayout>
                                    </Grid>
                                    <BoxView Color="Gray" Grid.Row="1" Grid.Column="0"></BoxView>
                                </Grid>
                            </ViewCell.View>
                        </ViewCell>
                    </DataTemplate>
                </ListView.ItemTemplate>
            </ListView>
        </StackLayout>
    </ContentPage.Content>
</ContentPage>