Lost scroll xamarin forms - xamarin.forms

Question

Hello friends how are you?
I have a problem with a listview and a scroll. It turns out that when I move the scroll up and the list is lost I can no longer return the list down. I really don't know how to explain the problem more clearly, so I uploaded a video that might clarify it a bit more. Thank you for your help and have a great day.
Thanks for the help
Scroll error
Here my code:
<ContentPage x:Name="QuoteDetailContentPage" Title="Detalle cotización" >
<Grid Padding="3" Margin="3">
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="50" />
</Grid.RowDefinitions>
<ScrollView>
<StackLayout Grid.Row="0" BindingContext="{Binding OpportunityDetailViewModel}">
<ListView
x:Name="QuoteDetailListView"
SeparatorVisibility="Default"
ItemsSource="{Binding OpportunityDetailView}"
IsRefreshing="{Binding IsRefreshing}"
ItemTapped="QuoteDetailListView_ItemTapped"
SelectionMode="None">
<ListView.Header>
<Frame>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="5*" />
<ColumnDefinition Width="1*" />
<ColumnDefinition Width="2*" />
<ColumnDefinition Width="2*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Label Grid.Row="0" Grid.Column="0" Margin="0" Text="Nombre" HorizontalTextAlignment="Center" HorizontalOptions="FillAndExpand" />
<Label Grid.Row="0" Grid.Column="1" Margin="0" Text="Cant." HorizontalTextAlignment="Center" HorizontalOptions="FillAndExpand" />
<Label Grid.Row="0" Grid.Column="2" Margin="0" Text="Precio" HorizontalTextAlignment="Center" HorizontalOptions="FillAndExpand" />
<Label Grid.Row="0" Grid.Column="3" Margin="0" Text="Total" HorizontalTextAlignment="Center" HorizontalOptions="FillAndExpand" />
<!--<Label Grid.Row="0" Grid.Column="4" Margin="0" Text="Acción" HorizontalTextAlignment="Center" HorizontalOptions="Fill" />-->
<BoxView Grid.Row="1" Grid.ColumnSpan="4" HeightRequest="1" BackgroundColor="LightGray" HorizontalOptions="FillAndExpand"/>
</Grid>
</Frame>
</ListView.Header>
<ListView.ItemTemplate >
<DataTemplate >
<ViewCell >
<ViewCell.ContextActions>
<MenuItem x:Name="MenuItemEdit" Clicked="MenuItemEdit_Clicked" Text="Editar" CommandParameter="{Binding .}" IsEnabled="{Binding IsMenuEnabled}">
<!--<MenuItem.IconImageSource>
<FontImageSource Glyph="Aceptar" FontFamily="{StaticResource FontAwesomeSolid}" Color="#5694ff" />
</MenuItem.IconImageSource>-->
</MenuItem>
<MenuItem x:Name="MenuItemDelete" Clicked="MenuItemDelete_Clicked" Text="Eliminar" IsDestructive="True" CommandParameter="{Binding .}" IsEnabled="{Binding IsMenuEnabled}">
<!--<MenuItem.IconImageSource>
<FontImageSource Glyph="Rechazar" FontFamily="{StaticResource FontAwesomeSolid}" Color="#e82424" />
</MenuItem.IconImageSource>-->
</MenuItem>
</ViewCell.ContextActions>
<Grid x:Name="Item" Padding="3">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="5*" />
<ColumnDefinition Width="1*" />
<ColumnDefinition Width="2*" />
<ColumnDefinition Width="2*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Label Grid.Row="0" Grid.Column="0" Margin="0" Text="{Binding ItemName}" BackgroundColor="Transparent" VerticalTextAlignment="Center" HorizontalTextAlignment="Start" HorizontalOptions="FillAndExpand" LineBreakMode="CharacterWrap"/>
<Label Grid.Row="0" Grid.Column="1" Margin="0" Text="{Binding Quantity}" BackgroundColor="Transparent" VerticalTextAlignment="Center" HorizontalTextAlignment="End" HorizontalOptions="FillAndExpand"/>
<Label Grid.Row="0" Grid.Column="2" Margin="0" Text="{Binding Price,Converter={StaticResource CurrencyCultureConverter}}" BackgroundColor="Transparent" VerticalTextAlignment="Center" HorizontalTextAlignment="End" HorizontalOptions="FillAndExpand" />
<Label Grid.Row="0" Grid.Column="3" Margin="0" Text="{Binding Total,Converter={StaticResource CurrencyCultureConverter}}" BackgroundColor="Transparent" VerticalTextAlignment="Center" HorizontalTextAlignment="End" HorizontalOptions="FillAndExpand"/>
</Grid>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
<ListView.Footer>
<StackLayout BindingContext="{Binding OpportunityDetailViewModel}">
<Grid BindingContext="{Binding OpportunityDetailViewModel}">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="7*" />
<ColumnDefinition Width="3*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Label Grid.Row="0" Grid.Column="0" Margin="0" Text="Total" HorizontalTextAlignment="End" Style="{StaticResource labelTitleStyle}"/>
<Label x:Name="TotalLabel" Grid.Row="0" Grid.Column="1" Margin="0" Text="{Binding DetailTotal}" HorizontalTextAlignment="End" Style="{StaticResource labelTitleStyle}" />
</Grid>
</StackLayout>
</ListView.Footer>
</ListView>
</StackLayout>
</ScrollView>
<StackLayout Grid.Row="1">
<Button x:Name="AddItemButton" Text="Agregar item" Clicked="AddItemButton_Clicked" />
</StackLayout>
</Grid>
</ContentPage>