Any known explanation of this? Why Order By ASC doesn’t return any item but order by DESC doesn’t?

I am using postgres with pg_vector extension

SELECT
       langchain_pg_embedding.document,
       langchain_pg_embedding.embedding <=> (ARRAY [-0.021213598549366,  ...,           -0.03685509413480759])::vector AS distance
FROM langchain_pg_embedding
         JOIN langchain_pg_collection
              ON langchain_pg_embedding.collection_id = langchain_pg_collection.uuid
WHERE langchain_pg_embedding.collection_id = '3831f45b-ee1b-4009-afa4-c7b0e1aadda7'
ORDER BY distance DESC
LIMIT 1;

I am expecting in each query I will get one row (but different).