Oh I see - sorry about that. I'm not sure what you mean in the widget settings though - I've got it set to thumbnail? I've attached a screenshot, hope that sheds some more light on what I might be doing wrong.
Oh my goodness...thank you for your patience! However, I've changed this to "Thumbnail" and the problem still persists. I've tried hard refreshing, and opening the page in an incognito window to see if it's my cache, but no luck.