Changing the zoom level will typically show these missing results. For example, I just checked my neighborhood. There are 5 restaurants within a few hundred feet of each other rated 4.5+ stars. With my filters set to 4.5+ stars, when I zoom out a bit, 4 of the 5 restaurants disappear, and I instead see a handful of 4.1 and 4.3 star restaurants. One of the 4.3 star restaurants is literally next door to a 5 star and 4.5 star restaurant, which are hidden at that zoom level.