Cover Photo looks low-resolution with artifacts around images
Images throughout my Rise 360 course look great — except for the Cover Image. With that image, formerly high-resolution images now look low-resolution and a bit blurry, and they have pixelation type artifacts around each image. (I have a 34-inch monitor I'm viewing fullscreen.)
In the attached Rise 360 course, I've tried saving the cover image as a JPEG at 80 percent, 90 percent, and 100 percent, and PNGs of various sizes. I've tried images from 1980 pixels wide to more than 5000 pixels wide. They all look like the attached file.