Low res "thumbnails"

The gallery pages for all my “fetched” albums show very low-res, and perhaps a bit large, images (thumbnails?) Clicking on them presents a good image.

Your sample gallery has much smaller and clearer thumbnails. Also they are constantly scaled by either width or height depending on whether the original image is landscape or portrait.

What am I missing?

Here’s an example:
https://thehudsons.com/pattymade-album/pattymade-2014/spring-sewing-2014/

Thanks.

https://www.ads-software.com/plugins/facebook-photo-fetcher/