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You just need to give a different ns for each marker. I guess you use the following code to specify a marker:

visualization_msgs::Marker marker;
marker.type = visualization_msgs::Marker::SPHERE;
marker.header.stamp = ros::Time::now();
...
marker.ns = "markerName"

You need to change the "markerName", e.g. "marker0","marker1","marker2"...