Does anyone know how to prevent this? It doesn't lose as much colour if I just screenshot it. But even the screenshot on the left is still slightly more muted than the original photo. I appreciate you taking time to respond. If you can't or don't know what this is, that's okay too.
Open in GIMP. Create a new image of the same height and width. Copy the original image and paste on top of the new image. Export the new image as jpeg.
I know it’s a hassle but that process should absolutely make sure to remove any colorspace or hdr nonsense that is getting messed up.