Pique theme default image not changing after removed

Here’s my site: gpncjamie.wordpress.com – I haven’t done much with it yet. Mostly I have just tried to get it set up. There are some default images that come with the ‘Pique’ theme, all coffeeshop-related. I deleted them and uploaded new images to my ‘Media Library’, and replaced the ‘Featured Image’ on each of the 4 ‘Pages’ that are included by default with the theme. The final page, which by default is entitled “Blog” but which I’ve changed to “Updates”, which is supposed to be where all the ‘Posts’ appear, this one just continues to use the theme’s default coffee image. It just ignores the image I’ve chosen, even though in the editor it shows the correct image. At first I thought, maybe it’s because I haven’t added the first blog post, so I added one just as a test. The coffee image is still there. If this is un-fixable, that’s a deal-breaker for me. I’m not going to use a theme that forces me to use this coffee imagery, which makes no sense for my site. So I’d like to figure out if this is fixable so I can decide whether to continue trying to create my (very basic, not trying to accomplish much here) site with this template or just select a different one instead. I’ve had difficulty in the past with the complex, user-created themes (some of them very lovely) not necessarily working, or features breaking when I’ve updated the version of WordPress, especially when I’m using a CPanel install from my host. I’ve even had a blog completely break, so I intentionally stuck with one of the default themes and kept the wordpress.com domain to keep things simple. So I’m a little surprised this one is having this issue. I’m sure this is not okay with anyone else either. My past experience has been, as long as you keep the blog on wordpress.com and use one of the default themes, the site will never break. This one seems broken out of the gate. Can anyone help? I like this simple theme for my purposes, and it works well as a single-page scroller on mobile; I don’t want anything any more complicated than this. Thanks!