Blurry images

When I use the Gallery Plus widget, the images look blurry. In the website link here, you can see images created using Elemector and below, images input using the widget. The picture of the ape is the same source image, so why is it blurry in Gallery Plus. It’s not blurry if you click on it to see it full size. Thank you.

The page I need help with: [log in to see the link]