Problem using vector3_stamped in Micro-ROS

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Hi all, I'm building a new robot with micro-ros, I'm using a Portenta-H7 and I'm having some problems posting the motor velocity to determine the position. To post the velocity I am using the class: geometry_msgs/msg/vector3_stamped.h from micro-ros, but when I echo the issue I get this:

 header:   
     stamp:
        sec: 536890720
        nanosec: 536890136   
        frame_id: "\x01" 
     vector:   
        x: 2.121995791e-314  
        y: 1.493392295746842e-154   
       z: 1.5e-323

I assume I'm building the sequence wrong, but I don't see the error, this is the code I'm using to make this post:

geometry_msgs__msg__Vector3Stamped__Sequence * speed_message;

// Vector Stamped 3
speed_message = geometry_msgs__msg__Vector3Stamped__Sequence__create(4);
geometry_msgs__msg__Vector3Stamped__Sequence__init(speed_message, 4);

speed_message->data[0].header.frame_id.data =  (char*)malloc(100 * sizeof(char));

char string3[] = "/robot_rpm";
memcpy(speed_message->data[0].header.frame_id.data, string3, strlen(string3) + 1);
speed_message->data[0].header.frame_id.size = strlen(speed_message->data[0].header.frame_id.data);
speed_message->data[0].header.frame_id.capacity = 100;


void speed_callback()
{
  struct timespec tv = {0};
  clock_gettime(0, &tv);

  /*speed_message->header.stamp.sec = tv.tv_sec;
    speed_message->header.stamp.nanosec = tv.tv_nsec;
    speed_message->vector.x = 0.5; //speed_act_left;    //left wheel speed (in m/s)
    speed_message->vector.y = 0.3; //speed_act_right;   //right wheel speed (in m/s)
    speed_message->vector.z = double(LOOPTIME) / 1000;  */

  speed_message->data[0].header.stamp.sec = tv.tv_sec;
  speed_message->data[0].header.stamp.nanosec = tv.tv_nsec;
  speed_message->data[0].vector.x = 0.5;
  speed_message->data[0].vector.y = 0.3;
  speed_message->data[0].vector.z = double(LOOPTIME) / 1000;

  RCSOFTCHECK(rcl_publish(&speed_publisher, &speed_message, NULL));

}

Does anyone have any idea why this is happening?

Thanks