The problem is that you are getting ModuleNumber from the Session table and ModuleName from the Module table. Your query says, "for this session, get all grade reports, and for those grade reports, get all students, and for all students, get all courses, and for all courses, get all course-module links, and for all course-module links, get all modules.
You need to use ModuleID as part of your WHERE statement. I am not fluent with MySQL, so to avoid butchering this I will use pseudo-SQL.
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