Distance Calculation is Extremely High

Hi Anton

we're forwarding tracking data from our server using Standard Wialon IPS Protocol
and we're getting this piece of data :

2017-05-16 14:09:52 DEBUG: [KafkaDataHandler] Handled position : latency = 4 ms , partition = 0 , offset = 42937203 , topic = lacaktraffictest , key = null , value = {"altitude":"0.0","server_time":"16-05-2017 14:09:52","distance":14802.32,"sat":7,"ip":"217.23.132.215","latitude":"-6.1776583333333335","master_group":"track@promogo.com","fix_time":"16-05-2017 14:09:39","speed":"17.818581000000002","output":"0","valid":"true","input":"0","protocol":"wialon","hostname":"ax3","name":"Driver 5","course":"139.0","id":"154299801199","adc1":"0.0","event":"2","totalDistance":465581.88,"adc2":"0.0","longitude":"106.79512","device_time":"16-05-2017 14:09:39","group":"panasonic@promogo.com"}
2017-05-16 14:09:54 DEBUG: [KafkaDataHandler] Handled position : latency = 2 ms , partition = 0 , offset = 42937225 , topic = lacaktraffictest , key = null , value = {"altitude":"0.0","server_time":"16-05-2017 14:09:53","distance":14689.89,"sat":7,"ip":"217.23.132.215","latitude":"-6.178446666666667","master_group":"track@promogo.com","fix_time":"16-05-2017 14:09:52","speed":"15.658753","output":"0","valid":"true","input":"0","protocol":"wialon","hostname":"ax3","name":"Driver 5","course":"141.0","id":"154299801199","adc1":"0.0","event":"2","totalDistance":465469.45,"adc2":"0.0","longitude":"106.79576","device_time":"16-05-2017 14:09:52","group":"panasonic@promogo.com"}

the coordinate is
-6.1776583333333335,106.79512
-6.178446666666667,106.79576

if i count it using coordinate calculator, distance should be 0.11 Kilometer

but in the data, it show 'distance:14689.89'

wonder if this bugs in traccar ?

btw, only several device id is having this kind of error

please help because we're stuck in this

You have to compare "latest" position with the received one, not two consequent messages in the logs.