I've created some functions in a specific schema, but the "Functions" section has nothing inside..
I create functions like this example:
CREATE FUNCTION pymax (a integer, b integer)
RETURNS integer
AS $$
if a > b:
return a
return b
$$ LANGUAGE plpythonu;
If the name is not schema-qualified, a function (like other objects) is created in your current schema. Your current schema is defined by the current setting of search_path.
To see your current search_path:
SHOW search_path;
There are a number of ways to set the search_path, more in this related answer:
How does the search_path influence identifier resolution and the "current schema"
To find out whether any function with a similar name exists in your database:
SELECT n.nspname, p.proname, pg_get_function_arguments(p.oid) As args
FROM pg_proc p
JOIN pg_namespace n ON n.oid = p.pronamespace
WHERE p.proname ILIKE '%pymax%';
If that doesn't find anything, the functions doesn't exist in this database. Maybe you created it in another db by mistake?
the "Functions" sectionwhere? In pgAdmin?