Error getting Imu via ros serial

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Hi guys. This question might be foolish to somebody, but I'm gonna post it anyway. I'm trying to get Imu value via ros serial and the composition of value is like below.

channel-id, quaternion(z y x w), gyroscope(x y z), accelerometer(x y z), Distance(x y z), battery(%) -->> in total, 15 datas. example: 100-0,0.1469,0.0001,-0.0056,0.9891,0.0,0.0,0.0,0.002,-0.014,1.000,0.000,0.000,68

and I tried to get a value via ros serial with delimiter ',', put in the vector 'result'. And I printed the size after printed the element of 'result' vector.

Baudrate is 115200, and my ros loop rate is 1000 for now. Here's the question. By some reason, I cannot get the full 15 data. While getting 11th data, it cutted off and (including the back part of cutted of data) 5 left prints to next time stamp. And I tried to do everything I can(changing baud rate, loop rate etc) but it doesn't figure out the problem. When I changed the loop rate, the size of result vector changes, but it's not 15(that I wanted to be).

the code is like below..originally it's a code that put imu data to sensor but commented it all out to just to check the data that I publish and its number(result.size()). If any knows how to figure out, pls help me.

#include <ros/ros.h>
#include <std_msgs/String.h>
#include <std_msgs/Empty.h>
#include <sensor_msgs/Imu.h>
#include <geometry_msgs/Quaternion.h>
#include <serial/serial.h>
#include <std_msgs/Float64.h>
#include <tf2/LinearMath/Quaternion.h>
#include <tf2_ros/transform_broadcaster.h>
#include <geometry_msgs/TransformStamped.h>
#include <tf/transform_broadcaster.h>
#include <iostream>
#include <sstream>
#include <string>
#include <typeinfo>

using namespace std;
serial::Serial ser;
int publish_rate = 100;

vector<string> split(std_msgs::String str, char Delimiter) {
    istringstream iss(str.data);
    string buffer; 
    vector<string> result = {};

    while (getline(iss, buffer, Delimiter)) {
        cout << buffer << ", ";
        result.push_back(buffer); 
    }

    return result;
}

void write_callback(const std_msgs::String::ConstPtr& msg){
    ROS_INFO_STREAM("Writing to serial port" << msg->data);
    ser.write(msg->data);
}

int main(int argc, char **argv)
{
   ros::init(argc, argv, "imu"); // 노드이름 imu
   ros::NodeHandle nh;
   ros::Subscriber imu_sub = nh.subscribe("write", publish_rate, write_callback);
   ros::Publisher imu_pub = nh.advertise<sensor_msgs::Imu>("imu_data", publish_rate);

   tf2::Quaternion q;
   static tf2_ros::TransformBroadcaster br;
   geometry_msgs::TransformStamped transformStamped;

   transformStamped.header.stamp = ros::Time(0);
   transformStamped.header.frame_id = "map";
   transformStamped.child_frame_id = "imu_link";

   q.setRPY(0, 0, 0);

   try{
      ser.setPort("/dev/ttyUSB0");
      ser.setBaudrate(115200);
      serial::Timeout to = serial::Timeout::simpleTimeout(publish_rate);
      ser.setTimeout(to);
      ser.open();
  }

  catch(serial::IOException& e){
      ROS_ERROR_STREAM("Unable to open port ");
      return -1;
  }

  if(ser.isOpen()){
        ROS_INFO_STREAM("Serial Port initialized");
  }
  else{
      return -1;
  }

  ros::Rate loop_rate(publish_rate);
  std_msgs::String sensor;
  sensor_msgs::Imu imu;
  imu.header.frame_id = "imu_link";

  int cnt = 0;

  while (ros::ok()){
    ros::spinOnce();
    if(ser.available()){
      ROS_INFO_STREAM("Reading from serial port");

      imu.header.seq = cnt; 
      transformStamped.header.seq = cnt;
      sensor ...