How to make cascading dropdown in a Angular Reactive Formarray work without messing the dropdown value

I have a form in angular 4 that containing First Name + Last Name and a formarray containing 2 dropdown(select) working as cascading dropdown and a delete button. The rest of the form also contains a send button and a add option button. I added a screenshot down here for you to understand better. The forms add , remove button and send button works there is 1 problem the cascading dropdown works only when there is 1 cascading dropdown ,when I add an extra cascading select the value from previous groups of cascading select second select get messed up. I added pics down here for a better explantion

As you can see on the 2nd and the 3rd picture the cascadingdropdown is working When I change select in Criteria I fet the right options to select in the 2nd dropdown

On the 4th picture 5th Ppicture and 6th Picture you can see the add options button works but when I select a Criteria in Option 2 first dropdown it messed up with Option 1 2nd Dropwown also now it contains the dropdown choices from the 2nd Option

Here is my html code

<form [formGroup] = "profileForm">

  <h1>Profile Form</h1>

 <div>
  <label for = "first-name-input">First Name</label>
  <input type="text" id="first-name-input" formControlName ="firstNameInput">
</div>
 <div>
    <label for = "last-name-input">Last Name</label>
    <input type="text" id="last-name-input" formControlName ="lastNameInput">
  </div>

  <div formArrayName="optionGroups">

    <div *ngFor="let optionGroup of profileForm.controls['optionGroups'].controls;  let i=index "[formGroup]="optionGroup">


      <h4>Option {{ i + 1 }} </h4>




     <div>
      <label for = "select-input">Criteria</label>
      <select id="select-input" (change)="onSelectSelect($event.target.value, i)"  formControlName ="selectInput">

          <option value="0" disabled selected>Select a Criteria</option>
          <option *ngFor="let select of selects"  [value]= "select.name">{{select.id}}</option>


        </select>

        <label for = "where-input">Option</label>
        <select id="where-input" formControlName ="whereInput">
  
            <option value="0" disabled selected>Select a Option</option>
            <option *ngFor="let where of wheres" value= {{where.name}}>{{where.id}}</option>


          </select>

          <button type ="button" (click)="removeOptionGroup(i)">X</button>

         


     </div>

    </div>

   </div>
   <button type ="button" (click)="addOptionGroup()">Add Options</button>
   <div>

    <button type ="button" (click)="saveProfileForm()">Send </button>

   

   </div>

</form>

And here is my component file

export class PowComponent {

 selects: Select[];
 wheres: Where[];


 public profileForm : FormGroup;

 public addOptionGroup(){

 const fa = this.profileForm.controls["optionGroups"] as FormArray;

  fa.push(this.newOptionGroup());

  }

  public removeOptionGroup(index: number){

   const fa = this.profileForm.controls["optionGroups"] as FormArray;

    fa.removeAt(index);

   }


   public saveProfileForm(){

    console.log(this.profileForm.value);
   }



   constructor(public router: Router,  public dropdownqueryservice:    DropDownQueryService , private fb : FormBuilder) {
    this.profileForm = this.fb.group({

        firstNameInput : [ "" ],
        lastNameInput : [ "" ],
        optionGroups : this.fb.array([
            this.fb.group({

              selectInput : [ "" ],
              whereInput : [ "" ],

          }),
       ]),
    });

    this.selects = this.dropdownqueryservice.getSelect();
    this.wheres=[];

}

onSelectSelect(selectid, i) {
    this.wheres = this.dropdownqueryservice.getWhere().filter((item)=> item.selectid == selectid);

  }


 private newOptionGroup() {
  return new FormGroup({

      selectInput: new FormControl(""),
      whereInput: new FormControl(""),

  });
   }

  }