I guess this isn’t necessarily relevant but I follow a couple of my former professors who regularly use Seek and have it set to automatically upload observations to iNaturalist. Most of their observations end up Casual for one reason or another because some of the metadata doesn’t get imported properly (missing location, date, photo, or even blank Unknown observations…). Could well be something similar going on at a smaller scale with the normal apps. Are you able to compare the stats for observations coming from Seek?