Formarray doesnt show all the records received from service/api

I am trying to patch the object received from webapi to an angular reactive form. The form also has a formarray. But, despite having more than 3 or more records only 2 records are being patched to the formarray of the reactive form.

I have two entities noseries and noseriesList, where a noseries has zero or many noseriesLists. So after obtaining noseries from webapi, i want to patch properties and navigation list "noseriesLists" of noseries into reactive form. Rest of the properties are being patched properly, but only 2 records of navigation list "noseriesLists" is being patched to the formArray nested inside the reactive form.

//initialization of form
    this.noseriesForm = this.fb.group({
      id: [null],
      description: ['', Validators.required],
      code: [ '', Validators.compose([Validators.maxLength(10), Validators.required])],
      noSeriesList: this.fb.array([
         this.initLine(), this.initLine()
      ])
    });

//patching the object received from service to form
 this.route.params.subscribe(routeParam => {
      if (routeParam.id) {
        this.noseriesService.get(routeParam.id)
        .subscribe((data: NoSeries) => {
          this.isCreateMode = false;
          this.noseries = data;
          this.noseriesForm.patchValue(this.noseries);
          console.log(this.noseries, 'data from api');
          console.log(this.noseriesForm.value,'formvalue');
        });
      }

    });

logging the data received from service shows 3 noseriesList records, whereas logging formvalue only shows 2 records of noseriesList.