Why does Postgres (PostGis) not correctly calculate occurrences of points in a radius?

Question

PostgreSQL

There is a table with this DDL:

CREATE TABLE buildings
(
    id INTEGER PRIMARY KEY NOT NULL,
    city VARCHAR(255) NOT NULL,
    street VARCHAR(255) NOT NULL,
    build_number DOUBLE PRECISION NOT NULL,
    location GEOMETRY(POINT,4326) // пробовал и GEOGRAPHY(POINT,4326)
);

There are 100 entries in the table, each location field has a value:

sprintf('SRID=4326;POINT(%s %s)', $faker->longitude(55, 55.08), $faker->latitude(82.93, 83.01));

That is, the points are concentrated in one place not far from each other.
Now displaying a point on the map:

Left map, this is the output of all points. The right map has a red dot in the radius of which the search will take place.
The red dot is at the coordinate

55.0502, 82.9615

We perform a search with a radius of 500m. Request:

SELECT *
FROM "buildings"
WHERE ST_DWithin(location, ST_GeomFromText('POINT(55.0502 82.9615)'), 500, TRUE)

Result:

We perform a search with a radius of 1500m. Request:

SELECT *
FROM "buildings"
WHERE ST_DWithin(location, ST_GeomFromText('POINT(55.0502 82.9615)'), 1500, TRUE)

Result:

Result with both maps on a smaller scale.

Answer 1

You are using ST_DWithin with four parameters, this is Geography mode. For it, objects must have the same SRID. Try to remove the fourth parameter or create a point with an explicit SRID
ST_GeomFromText('POINT(55.0502 82.9615)', 4326)