Joining 3 tables and it is duplicating

Question

SELECT gr.Name as GroupName,gr.Id as GroupId

FROM SpecificationAttribute sa

INNER JOIN SpecificationGroup gr

on SpecAtr.GroupId = gr.Id

left JOIN CategoryAttribute as cat on cat.SpecificationAttributeId = SpecAtr.Id

 

 the rows are duplicating 

so gr.Id is prymary key SpecAtr.Id is primary and cat.SpecificationAttributeId is foreignkey

 

pleas help me