ImageCell Image source not appearing

I have a ListView, with an ItemTemplate like so:

<ListView.ItemTemplate>
    <DataTemplate>
        <ImageCell Text="{Binding Name}"
            Detail="{Binding Description}"
            ImageSource="{Binding Image}" />
    </DataTemplate>
</ListView.ItemTemplate>

The list loads, but no images are visible. The Image is of type ImageSource and is loaded from a URL using ImageSource.FromUri.

If I refresh the list, some images might load, although I think now nothing ever happens (didn't think I changed anything).
When added to the list, Image is definitely set to an ImageSource with the url I gave.

Does anyone have any clues on how to fix this? (This is my first post so please excuse anything I do wrong)