iPhone 14 Pro Grainy Low Light Photos

Hello everyone, I recently got my iPhone 14 Pro and for most circumstances the camera has been great and I think the processing does a good job of improving the photo. But I noticed that if I am in a reasonably dark environment and I choose not to use night mode, photos are much more grainy than they are in the viewfinder. The first photo linked is what I see in the viewfinder, the second is the photo afterward, and the third is the processed photo. This doesn’t happen in night mode and it’s only if I choose to use just the camera in a dark environment. Is this normal? Thanks.