Problem with the Export to jpg in iPad Pro 2019 12.9” from a RAW

I've been having an issue 2 weeks ago when I export to JPG... I already uninstalled and installed again. The problem it's that image exported appears with too much noise, noise that doesn't appears when I see the image in Lightroom. Original images are in RAW. Well obviously I already move my parameters of noise, exposure, details etc.