@az93 This might be a silly question, but did you press F12 to render the image? I can see orange lines at the top and the bottom, which makes me think it might be a screenshot. Eevee is a real-time engine, but you still need to go through the render process. Alternatively, if it is a render, I have seen similar artefacts caused by an overly strong denoiser. You can check the settings in the ‘View Layer’ tab of the Properties panel. Default strength seems to be 0.5.
