Obstacle avoiding sensor TFMINI V1.8.1 issue with avoiding object in loiter and other modes

hi friend am using in my multicopter using tfmini v1.8.1 sensor for my copter front, back, right and left 4 sensor, when am flying in loiter mode i kept avoid setting to stop if the object detect with in 2 meter but copter not yet stop. then i kept to slid option this function also not working. can you help me out this issue.

Common settings:
AVOID_ENABLE = 1 [0 = UseFence; 1 = UseProximitySensor; 2 = UseBeaconFence;]
AVOID_MARGIN = 4 [Can be 1 to 10m; Vehicle will attempt to stay at least this distance (in meters)
from objects while in GPS modes]
PRX1_TYPE = 4 [RangeFinder]
Settings for first TFmini-S:
RNGFND1_ADDR = 16 [Address of 1 TFmini-S in decimal (0x10 = 16)]
RNGFND1_GNDCLEAR = 25 [Unit: cm, depending upon mounting height of the module and should
be larger LiDAR than non-detection zone]
RNGFND1_MAX_CM = 400 [It could be changed according to real demands but should be smaller
than effective measure range of LiDAR, unit is cm]
RNGFND1_MIN_CM = 30 [It could be changed according to real demands and should be larger than
LiDAR non-detection zone, unit is cm]
RNGFND1_ORIENT = 0 [1 TFmini-S real orientation]
RNGFND1_TYPE = 25 [TFmini-S IIC same as TFmini-Plus IIC]
Settings for second TFmini-S:
RNGFND2_ADDR = 17 [Address of #2 TFmini-S in decimal; (0x11 = 17)]
RNGFND2_GNDCLEAR = 25
RNGFND2_MAX_CM = 400
RNGFND2_MIN_CM = 30
RNGFND2_ORIENT = 1 [#2 TFmini-S real orientation]
RNGFND2_TYPE = 25 [TFmini-S IIC same as TFmini-Plus IIC]

liker this am using my 4 sensors