Published topic name is different than specified by `advertise`

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Hello everyone I am writing a simple package which contains two executable nodes. One of the two nodes acgen_node_test should publish a message to the topic acgen/des_currents_reg and the other node acgen_node should receive said message.

Now in my sender node acgen_node_test I advertise using

currents_pub = nh.advertise<acgen::DesCurrentsReg>("acgen/des_currents_reg", 256);

but for some reason, it seems like these messages get published under the topic /acgen_node/acgen/des_currents_reg instead of just acgen/des_currents_reg (at least that's what rostopic list shows). I try subscribing in my receiver node using:

des_currents_res_subs=nh.subscribe("acgen/des_currents_reg",64,msg_des_currents_reg_cb);

I'm not sure how I can resolve this issue?

Full Code of sender node acgen_node_test:

#include <ros/ros.h>
#include <ros/console.h>
#include "acgen/DesCurrentsReg.h"
#import <math.h>

ros::Publisher currents_pub;
const double delta_T=20e-3;     //publishing time interval
const double i_amp=1.0;         //amplitude of desirec currents [A]
const double omega=2*M_PI*5;    //frequency of reference waveform

void acgen_timer_cb(const ros::TimerEvent&){
    double current=i_amp*sin(omega*delta_T);

    std::vector<double> currents={1.0,0,0,0,0,0};

    currents_pub.publish(currents);
}

//main
int main(int argc,char** argv){
    ros::init(argc, argv, "acgen_node_test",ros::init_options::NoSigintHandler);

    ROS_INFO("staring up acgen test node");

    ros::NodeHandle nh("~");

    currents_pub = nh.advertise<acgen::DesCurrentsReg>("acgen/des_currents_reg", 256);

    //main timer shows callback function send the driver messages
    ros::Timer timer = nh.createTimer(ros::Duration(delta_T), acgen_timer_cb);

    ROS_INFO("Start spinning");

    ros::spin();
}

Main Routine of receiver node acgen_node:

int main(int argc,char** argv){
    ros::init(argc, argv, "acgen_node",ros::init_options::NoSigintHandler);

    ROS_INFO("startup");

    signal(SIGINT, mySigintHandler);

    ros::NodeHandle nh("~");

    //init tcp connection
    bool comm_est_succeeded=init_comm();
    if(!comm_est_succeeded){
        if(errno==ETIMEDOUT)
            ROS_ERROR("Could not establish TCP connection to ControlCard: Timeout");
        else
        ROS_ERROR("Could not establish TCP connection to ControlCard: %s",strerror(errno));
        ros::shutdown();
        return EXIT_FAILURE;
    }
    ROS_INFO("Established Connection");

    //main timer showse callback function send the driver messages
    ros::Timer timer = nh.createTimer(ros::Duration(20e-3), acgen_timer_cb);
    ROS_INFO("Sending data packets at an interval of %f ms",send_interval*1e3);

    //register services
    srv_enable_acgen=nh.advertiseService("acgen/enable",srv_enable_acgen_cb);
    srv_stop_acgen=nh.advertiseService("acgen/stop",srv_stop_acgen_cb);
    srv_run_regular=nh.advertiseService("acgen/run_regular",srv_run_regular_cb);
    srv_run_resonant=nh.advertiseService("acgen/run_resonant",srv_run_resonant_cb);

    //register subscribers
    des_currents_res_subs=nh.subscribe("acgen/des_currents_reg",64,msg_des_currents_reg_cb);
    des_duties_subs=nh.subscribe("acgen/des_duties",64,msg_des_duties_reg_cb);

    ROS_INFO("Start spinning");

    ros::spin();
}