Image Download too small

Hi. I enabled the “Download” button for all my photos so that clients can download the full scale image that is shown. However, when they click on that download it downloads a tiny small little image instead. I see no option to modify this within the settings other than enabling or disabling it.. please advise.

Thank you!

Sample would be here:
https://www.yachtingimage.com/mv-living-the-life-interior/
click on any image, then download.

https://www.ads-software.com/plugins/easy-media-gallery/