I know what dpi is, but thank you. I went back to double check and the dpi is already set at 96. I haven't changed the dpi on any images on this computer yet so I'm quite sure it was at 96 dpi before, too.
Is there nothing else I can do to have paint.NET display the image size correctly within the program? It seems to me it is treating the smaller "100%" size as the actual full size of the image and scaling accordingly, and this is very frustrating because the version I actually get is blown up and blurry.
Problem was with Windows 10 scaling the images up in my browser/image viewer(s). Thanks + sorry to bother you.