Retina Crop

Hi there,

Im confused with how the Retina Crop works. In the settings I have tick “yes” to retina. and set the size to 400×280. But when it outputs it save the image as “http://figtreeoperimac.fritz.box:5757/wp-content/uploads/2016/10/successful-businesswoman-picture-id479292358_800x560_acf_cropped-7.jpg” eg it showing the retina version on non Retina device. I also can see in upload folder it generated a a file called “successful-businesswoman-picture-id479292358_800x560_acf_cropped-7-400×280@2x.jpeg” and “successful-businesswoman-picture-id479292358_800x560_acf_cropped-7-400×280.jpg” Why doesnt it use these.

The image is output by Image arry