Facebook can’t download featured image

Hi,

The URL I gave is to Facebook’s Sharing Debugger and it gives me the following error message:

Provided og:image, https://gaelicdivinations.com/sys/wp-content/uploads/2018/05/leo-350690_1280.jpg could not be downloaded. This can happen due to several different reasons such as your server using unsupported content-encoding. The crawler accepts deflate and gzip content encodings.

I’m not having this problem on any of my other WP installations, just this one. My installation is up to date and I’m using a child theme made from light-skeleton. Can anyone spot what’s going on here?

Thanks

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