Projects with small places often don’t capture observations due to the accuracy circle breaking the bounding box. The suggested work around seems to be make it a traditional project. The observations still need to land within the place.
https://help.inaturalist.org/en/support/solutions/articles/151000169942-why-is-my-observation-not-showing-up-in-a-place-or-collection-project-i-know-i-observed-it-there-
Suggestion: instead of having the bounding box tight up against the place - add another 100-200 feet in all directions. Enough to capture observations with not uncommon accuracy, but not so much to include observations with HUGE uncertaintity.
The other thing to keep in mind is that if I’m inside a place, but my subject is outside it, the observation will get included (assuming accuracy is OK). The GPS in your camera has no idea where your subject is - it locates the GPS receiver (photographer). So this notion that its important to exclude observations that don’t belong based only on accuracy and place geometry makes little sense. You’re probably already getting observations that don’t belong.
eg: compare locations vs images - almost all of these appear to have photographed from the shore, but the subjects were out in the ocean - do they belong?
https://www.inaturalist.org/observations?place_id=109417&subview=map&taxon_id=152871