Multiple laser on the same topic and frame

Hi, I have multiple lasers with different angle increment. I publish the data to the same topic and frame. However, since the laser are of different types, I publish different angle_max, angle_min and angle_increment corresponding to each laser message. The problem is that the RVIZ only shows one of the laser. Sometimes, it only shows first laser and the other time only shows the second laser. This problem is quite weird since I publish the messages to the same topic and tf frame. The same problem happened when I use Gmapping; only one laser is chosen randomly to be used for mapping. Appreciate any input. Regards