MAT_UART_prinft twice without delay of TI RTOS on MSP430F6779

Dear Experts

If I call MAT_UART_prinft twice without delay, I only got "Hello!!!!!!" output (the second command is ingored).

MAT_UART_printf(1,"\r\n Hello!!!!!!!!!!!!",20);
MAT_UART_printf(1,"\r\n How are you!!!!!!!!!!!!!!!!",30);

If I add a delay between two MAT_UART_prinft, I can get both "Hello!!!!!!" and "How are you!!!!!!" output.

MAT_UART_printf(1,"\r\n Hello!!!!!!!!!!!!",20);
_delay_cycles(115200);
MAT_UART_printf(1,"\r\n How are you!!!!!!!!!!!!!!!!",30);
_delay_cycles(115200);
 
Why the second command is ingored without delay?

Thanks for your comment.

/*
 *  ======== main.c ========
 */

#include <xdc/std.h>

#include <xdc/runtime/Error.h>
#include <xdc/runtime/System.h>

#include <ti/sysbios/BIOS.h>

#include <ti/sysbios/knl/Task.h>

#include "MAT_Driver.h"

/*
 *  ======== taskFxn ========
 */
Void taskFxn(UArg a0, UArg a1)
{
    //System_printf("enter taskFxn()\n");

    //Task_sleep(10);

    //System_printf("exit taskFxn()\n");

    //System_flush(); /* force SysMin output to console */

    MAT_flsh_init();

    while(1)
    {
        MAT_UART_printf(1,"\r\n Hello!!!!!!!!!!!!",20);
        _delay_cycles(115200);
        MAT_UART_printf(1,"\r\n How are you!!!!!!!!!!!!!!!!",30);
        _delay_cycles(115200);
        //GPIO_write(GPIO_BLUE,0); // led on
        //MAT_flsh_Test();
        //GPIO_write(GPIO_BLUE,1); // led off
        //GPIO_toggle(GPIO_BLUE);
        //MAT_StringPrintf("\r\n**");
        Task_sleep(1);//250);
    }
}

/*
 *  ======== main ========
 */
Int main()
{
    Task_Handle task;
    Error_Block eb;

    System_printf("enter main()\n");

    Error_init(&eb);
    task = Task_create(taskFxn, NULL, &eb);
    if (task == NULL) {
        System_printf("Task_create() failed!\n");
        BIOS_exit(0);
    }

    MAT_GPIO_config_init();

    MAT_UART_set_init();
    MAT_UART_config_init();

    MAT_SPI_config_init();
    MAT_SPI_set_init();

    BIOS_start();    /* does not return */
    return(0);
}