MSP430FR5994: OutOfBox_MSP430FR5994 code question with the Launchpad evaluation board

Part Number: MSP430FR5994

I understand the OutOfBox code uses the RTC_C to manage the rate which it collects temperature/voltage data (either to send to PC GUI or to log in FRAM). When sending data to the GUI the updates seem to happen more frequently than I expected from the RTC initialization code. The Init_RTC initialization code appears setup to trigger an interrupt every minute but the updates frequency seems to be every 25s or about twice as fast. I added some calibration code to output 512 Hertz and measured the output at 511.2Hz which, without any additional temp/voltage calibration, seems very reasonable (see image below).  I then speculated that maybe the update loop was driven by a timer other than the RTC. I couldn't find this timer so I added some code to flash LED each time the RTC ISR was entered. The flashes occur with the updates so I am fairly convinced that the RTC does drive the events the updates.  Can anyone explain why these updates are occurring more frequently than once a minute? Is it possible the "Minute event" is triggered twice a minute, once for each transition of the minute waveform? Any help is greatly appreciated. 

void Init_RTC()
{

    //Setup Current Time for Calendar (BINARY FORMAT)
    calendar.Seconds    =  0x25;
    calendar.Minutes    =  0x05;
    calendar.Hours      =  0x0D;
    calendar.DayOfWeek  =  0x02;
    calendar.DayOfMonth =  0x0C;
    calendar.Month      =  0x02;
    calendar.Year       = 0x07e3; //0x2019;


    // Initialize RTC with the specified Calendar above
    RTC_C_initCalendar(RTC_C_BASE,
                       &calendar,
                       RTC_C_FORMAT_BINARY); //using RTC_C_FORMAT_BCD scrambles file time stamp

    RTC_C_setCalendarEvent(RTC_C_BASE,
                           RTC_C_CALENDAREVENT_MINUTECHANGE
                           );

    RTC_C_clearInterrupt(RTC_C_BASE,
                         RTC_C_TIME_EVENT_INTERRUPT
                         );

    RTC_C_enableInterrupt(RTC_C_BASE,
                          RTC_C_TIME_EVENT_INTERRUPT
                          );

    //Start RTC Clock
    RTC_C_startClock(RTC_C_BASE);
}