[RVIZ] MarkerArray Display

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Hi. I am using: RVIZ 1.13.1 melodic ubuntu 18.04

I have a task to visualize sensor data on a map. In the image below, it can be saw that the blue MarkerArray able to display correctly according to the path that the robot has moved. However, suddenly the MarkerArray failed to display on the left hand side and bottom right of the map. It seems like it is unable to publish anything if the coordinate provided is a negative value.

Can anyone suggest me what should i do to solve this issue ?

Below is my coding in python to generate marker array.

        triplePoints = []
        colorsGroup = []
        markerArray = MarkerArray()
        for (x,y,z,a) in gdm_mean_data:
            if not numpy.isnan(a) and a > 0.10000000149 :
                p = Point() 
                p.x = x
                p.y = y
                p.z = -5
                marker = Marker()
                marker.header.frame_id = "/map"
                marker.type = marker.POINTS
                marker.action = marker.ADD
                marker.scale.x = 0.1
                marker.scale.y = 0.1
                marker.scale.z = 0.1
                colorsGroup.append(ColorRGBA(0,0,a,a))
                marker.pose.orientation.w = 1
                t = rospy.Duration()
                marker.lifetime = t
                triplePoints.append(p)
        marker.points = triplePoints
        marker.colors = colorsGroup
        markerArray.markers.append(marker)
        mean_marker.publish(markerArray)