Floorplan images show blurry

In the listings for appfolio plugin listing pages all the floor plan images show very pixelated and blurry.

Here is an example https://farrellcommunities.com/availabilities/?lid=656fae50-8687-4bc1-b4b3-ac3e7da9e536&url= . You can see in the gallery the floor plan images look very blurry.

The source images are hires enough to show correct. What can be the fix for this? I have been trying to reach the developers of this plugin for weeks and I get no response back.

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