Hi Jesper,
Looks like there’s some SVG embedded within that image:
data:image/svg+xml,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20width%3D%27512%27%20height%3D%27491%27%20viewBox%3D%270%200%20512%20491%27%3E%3Crect%20width%3D%27512%27%20height%3D%273491%27%20fill-opacity%3D%220%22%2F%3E%3C%2Fsvg%3E
Is this a PNG file or an SVG file you’re trying to use?
Or perhaps – maybe your Cache/CDN plugin is modifying images on the fly to optimize the site and add lazy loading?
Either way – it seems that the image isn’t rendered because something is modifying the image on the fly. The plugin you’re using would work on most WordPress pages, but because I’m intentionally not running any hooks that would allow plugins to add more JS than necessary – lazy loading doesn’t work here, and so your image isn’t visible.
I’d recommend looking into how you can disable whatever optimizations you have in place on Bio-links pages. Caching the HTML would be a good idea, but any other minifiers/lazy-loading things aren’t necessary as the plugin is already optimized.