How to order by count() in JPA

I am using This JPA-Query:

SELECT DISTINCT e.label FROM Entity e 
GROUP BY e.label 
ORDER BY COUNT(e.label) DESC

I get no errors and the results are sorted almost correct but there are some values wrong (either two values are flipped or some single values are completly misplaced)

EDIT:

Adding COUNT(e.label) to my SELECT clause resolves this problem for this query.

But in a similar query which also contains a WHERE clause the problem persists:

SELECT DISTINCT e.label, COUNT(e.label) FROM Entity e 
WHERE TYPE(e.cat) = :category 
GROUP BY e.label 
ORDER BY COUNT(e.label) DESC