Simply put the entity goes to different spots in the house after each time it's picture is taken. The detection might have caught to something just on the edge of the polaroid photo. Hope you try it again and are able to see it properly in the photos.
The static areas are to show that you're close to it so you can try and understand where it is. But the game's concept is all about the fact that it's unseen. I just hope we didn't make it too hard :P
Viewing post in Eldritch Snapshot jam comments
Thanks for explaining, after replaying I was able to find unfathomable pieces/parts of the entity on the snapshots! I really love the concept of only being able to see it through the photos. I like how original the design of the entity was because it wasn't like anything I'd ever seen before. Fun to play and unnerving. Like that itchy feeling of having something infest your home but not knowing where the hell it is and how to get rid of it.