Could not clear the obstacle_layer of costmap_2d package in ros hydro

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Hi all,

I have followed the navigation tutorial for ros hydro this link and other link. I can see the obstacles are updated in the obstacle_layer. However the "clearing observation" task is not clear enough. For example, When I move in an move out the laser field of view, there are still several points can not be removed. Here is the link picture of obstacle_layer Did anyone have same problem before?

Here are my jaml and launch: Costmap_common_params

obstacle_range: 2.5
raytrace_range: 3.0
footprint: [[-0.225,-0.225],[-0.225,0.225], [0.225, 0.225], [0.225,-0.225]]
#robot_radius: 0.225
inflation_radius: 0.55
obstacle_layer:
observation_sources: laser
laser: {sensor_frame: laser, data_type: LaserScan, topic: /scan, marking: true, clearing: true, inf_is_valid: true}

Local_costmap_params

local_costmap:
global_frame: /map
robot_base_frame: /base_footprint
update_frequency: 5.0
publish_frequency: 5.0
static_map: false
rolling_window: true
width: 6.0
height: 6.0
resolution: 0.01
 plugins:
  - {name: footprint_layer, type: "costmap_2d::FootprintLayer"} 
  - {name: obstacle_layer,  type: "costmap_2d::ObstacleLayer" }
  - {name: inflation_layer, type: "costmap_2d::InflationLayer"}

Global_costmap_params

global_costmap:
global_frame: /map
robot_base_frame: /base_footprint
update_frequency: 5.0
static_map: true
plugins:
- {name: static_layer, type: "costmap_2d::StaticLayer"}

Move_base

enter code here
<!-- -->
<launch>
<!-- Run the map server -->
<node name="map_server" pkg="map_server" type="map_server" args="$(find robot_platform)/maps/map.yaml" output="screen" clear_params="true"/>
<include file="$(find amcl)/examples/amcl_diff.launch" >
</include>
<node pkg="move_base" type="move_base" respawn="false" name="move_base" output="screen">
<rosparam file="$(find robot_platform)/params/costmap_common_params.yaml" command="load" ns="global_costmap" />
<rosparam file="$(find robot_platform)/params/costmap_common_params.yaml" command="load" ns="local_costmap" />
<rosparam file="$(find robot_platform)/params/local_costmap_params.yaml" command="load" />
<rosparam file="$(find robot_platform)/params/global_costmap_params.yaml" command="load" />
<rosparam file="$(find robot_platform)/params/base_local_planner_params.yaml" command="load" />
</node>
</launch>