Duplicated data in MVC linq query

I have a question regarding linq query. My controller code looks like this:

public ActionResult Show_Trans(int id = 0)
    { 
        //this checks if the id exists in the database
        var check = db.Student_Trans.Where(s=>s.student_id == id).FirstOrDefault();
        // if not, show a javascript alert
        if(check == null){
            return Content("<script type='text/javascript'>alert('No transaction so far.');</script>");
        }

        // this return the data that equals to the id
        return PartialView(db.Payments_vw.Where(s=>s.student_id == id).ToList());

    }

In my database view (Payments_vw), for example, the student with student id of 2 has 3 transactions namely: Miscellaneous, Parents Share, Uniform.

The question is: when I tried to view it in my Views, it returns the exact number of rows but the datas are repeated or should I say, all are in Miscellaneous transaction but the Parents Share and Uniform are not shown. Why? Any help is greatly appreciated. Thanks.