Offset between input (sensor_msgs::PointCloud2) and its conversion to (pcl::PointCloud<pcl::PointXYZ>) [RViz]

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I have a input cloud called cloud of type sensor_msgs::PointCloud2ConstPtr& and want to convert it to cloud_conv of type enter code here :

void callback(const sensor_msgs::PointCloud2ConstPtr& cloud)
{
pcl::PointCloud<pcl::PointXYZ>::Ptr cloud_conv (new pcl::PointCloud<pcl::PointXYZ>);
pcl::fromROSMsg(*cloud, *cloud_conv);

Publishing *cloud into Rviz directly without conversion plots the correct result as a sanity check:

sensor_msgs::PointCloud2 testcloud;
testcloud.header.frame_id = "base_link";
pub_test.publish(*cloud);

However plotting the converted cloud (and reconverted back) shows the correct cloud in RViz but with some offset in all x,y, and z directions:

sensor_msgs::PointCloud2 testcloud;
pcl::toROSMsg(*cloud_conv, testcloud);
testcloud.header.frame_id = "base_link";
pub_test.publish(testcloud);
}

So my question is, how to I make sure testcloud has no offset in x,y,z in regards to the input (reference) cloud *cloud? Is there some parameter for this that I'm missing? I have tried searching and am lost, thank you!