@thendrix sdxl is meant for 1024x1024 images, if you extend that too far you will get weird effects like the doubling of the subject you see in that image. What you need to do is to generate an image close to 1024x1024 (something like 768x1024) and then blow it up with the hires fix option to a larger size, so that it takes the first image as input for a second generation.