The larger photo has a natural distortion you would usually see on a non-phone camera, so it's tolerable it's just that people expect more usability on a phone lens. It looks like it's trying to apply a digital correction that worked in reverse to worsen it. The other two really don't look anything like lens distortion to me. The warping and smearing isn't right. Did you select the Extra Wide or did you zoom out in the app?
I'd test it in settings with less information (and less nature). You're right, there are samples out there with the same issue, I think people are reading it as bokeh depth texture. Yours looks pretty bad though, so if it's reproducing it in more minimal settings, I'd consider going to Apple.