image with caption not appearing on front page

I am trying to make an image with a caption appear on the front page of my blog. I have tried this with both the current first stickied post, as well as subsequent new blog posts.

For some reason the picture will not show up on the front page, but only on the full page page blog page, when the picture has a caption. If I remove the caption, the image will appear. I’ve not seen anyone else experiencing this or any fix suggested.

Any help would be much appreciated. https://learnpbl.com

Thanks.