why viewChange is called 2 times when I select to view as month

[bxTruong]

why viewChange is called 2 times when I select to view as month

SfCalendar(
      view: CalendarView.schedule,
      controller: homeController.middleController,
      allowViewNavigation: false,
      allowedViews: [
        CalendarView.day,
        CalendarView.week,
        CalendarView.workWeek,
        CalendarView.month,
        CalendarView.schedule,
      ],
      dataSource: MeetingDataSource(homeController.listMeeting),
      firstDayOfWeek: 1,
      todayHighlightColor: AppConstant.customButtonColor,
      headerHeight: 0,
      viewHeaderHeight: 56,
      monthViewSettings: MonthViewSettings(
          dayFormat: "EEEE",
          showAgenda: false, 
          showTrailingAndLeadingDates: false,
          appointmentDisplayMode: MonthAppointmentDisplayMode.appointment),
      onTap: (CalendarTapDetails details) {
        homeController.getInfoMeeting(details);
        homeController.showRightPanelAppointments(details);
      },
      onLongPress: (calendarLongPressDetails) {
        showMeetingCreateView(Get.context);
      },
      onViewChanged: (ViewChangedDetails viewChangedDetails) {
        List<DateTime> dates = viewChangedDetails.visibleDates;
        print("View Change $dates");
        homeController.checkVisibleDate(dates);
      },
      viewHeaderStyle: ViewHeaderStyle(
        backgroundColor: AppConstant.customHeaderCalenderColor,
      ),
      timeSlotViewSettings:
          TimeSlotViewSettings(dayFormat: "EEE", dateFormat: "dd"),
    )