Distinct rows from a join
if you want to select unique record from other join table which has same FK in multiple row you can use your query as

 SELECT
        wpss_quesset.quesset,
        wpss_questions.*
    FROM wpss_quesset
    JOIN wpss_questions 
        ON wpss_quesset.id = wpss_questions.ques_set_id
   GROUP BY wpss_quesset.id


OR If you want to get all record that of related FK you should use group concat with group by

Example

 SELECT
        wpss_quesset.quesset,
        GROUP_CONCAT( wpss_questions.question)
        wpss_questions.*
    FROM wpss_quesset
    JOIN wpss_questions 
        ON wpss_quesset.id = wpss_questions.ques_set_id
   GROUP BY wpss_quesset.id