local_cosmap remark but can't clear

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Hi,
I create 2 laser scan by deepth_image_tolaser, one is middle and one is lower z=2-30cm.
when I insert or remove object:
- glocal_costmap is clean and mark as obstacle
- local_costmap is remark obstacle but can't clean

This is my cosmap config.
footprint: [ [0.18, 0.18], [-0.18, 0.18], [-0.18, -0.18], [0.18, -0.18] ]

map_type: voxel

obstacle_layer:
enabled: true
max_obstacle_height: 1.2
origin_z: 0.0
z_resolution: 0.2
z_voxels: 2
unknown_threshold: 15
mark_threshold: 0
combination_method: 1
track_unknown_space: true #true needed for disabling global path planning through unknown space
obstacle_range: 2.5
raytrace_range: 0.18 #3
origin_z: 0.0
z_resolution: 0.2
z_voxels: 2
publish_voxel_map: false

observation_sources: scan scan_low bump
scan:
data_type: LaserScan
topic: scan
observation_persistence: 0.0
marking: true
clearing: true
min_obstacle_height: 0.1
max_obstacle_height: 1.2

scan_low:
data_type: LaserScan
topic: scan_low
observation_persistence: 0.0
marking: true
clearing: true
min_obstacle_height: 0.2
max_obstacle_height: 0.7

bump:
data_type: PointCloud2
topic: mobile_base/sensors/bumper_pointcloud
observation_persistence: 6000.0
marking: true
clearing: false
min_obstacle_height: 0.0
max_obstacle_height: 0.15
# for debugging only, let's you see the entire voxel grid

inflation_layer:
enabled: true
cost_scaling_factor: 5.0 # exponential rate at which the obstacle cost drops off (default: 10)
inflation_radius: 0.5 # max. distance from an obstacle at which costs are incurred for planning paths.

static_layer:
enabled: true
robot_radius: 0.18 # distance a circular robot should be clear of the obstacle (kobuki: 0.18)