Code challenge says my code is returning the wrong level

my code when ran produced all the right levels (ran creating other variables and using console.log). I am not sure why it is telling me it is returning the wrong level.

Below is the code I used to check the right levels:

class Student { constructor(gpa, credits){ this.gpa = gpa; this.credits = credits; }

// stringGPA() {
//     return this.gpa.toString();
// }

get level() 
{
  if(this.credits <= 30){
  return "they are a 'Freshman'";
  }
  if (this.credits >= 31 && this.credits < 61) {
   return "they are a 'Sophmore'";
  }  
  if (this.credits >= 61 && this.credits < 91) {
   return "they are a 'Junior'";
  } 
   if(this.credits > 90) {
  return "they are a 'Senior'";
  }

}

}

const student1 = new Student(3.9,29); const student2 = new Student(3.9,31); const student3 = new Student(3.9,60); const student4 = new Student(3.9,61); const student5 = new Student(3.9,91);

console.log(student1); console.log(student1.level); console.log(student2.level); console.log(student3.level); console.log(student4.level); console.log(student5.level);

class Student {
    constructor(gpa, credits){
        this.gpa = gpa;
        this.credits = credits;
    }

    stringGPA() {
        return this.gpa.toString();
    }

  get level()
  {
          if(this.credits <= 30){
      return "they are a 'Freshman'";
      }
      if (this.credits >= 31 && this.credits < 61) {
       return "they are a 'Sophmore'";
      }  
      if (this.credits >= 61 && this.credits < 91) {
       return "they are a 'Junior'";
      } 
       if(this.credits > 90) {
      return "they are a 'Senior'";
      }


  }

}

const student = new Student(3.9,60);