Zabbix Log Monitoring - Duplicate received strings from Log

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Please help to understand what wrong in configuration Or server, Or Item
Zabbix version Zabbix 4.0.13. Zabbix is allocated on two servers - Application and database.

Seems The problem with all the Log monitoring. I try to configure second time the log monitoring, but it doesn't work right.


For example - I have the txt file and I added strings one by one in it, waiting some time between changes
---------------------begin-----------------------------------------------------------------------------------
License check passed for the following license: "052507483171100-8100454838".
222
This is test string
License check passed for the following license: "052507483171100-8100454838".
Test License check test NOT passed for the following license: "052507483171100-8100454838".
---------------------the end-----------------------------------------------------------------------------------

Zabbix must to fire when String is not beginning from "License check passed"

My item and trigger are simple:

------------------------------------Item-----------------------------------------------------

• Name = log "License check passed"
• Type = Zabbix agent (active)
• Key = log["C:\1c_lic_check\log.txt"]
• Type of information = Log
• Update interval = 30s

-----------------------------------------------------------------------------------------
------------------------------Trigger----------------------------------------

• Name = log "License check passed"
• Severity = Average
• Problem expression

{ServerName:log["C:\1c_lic_check\log.txt"].str(License check passed)}=0

• OK event generation = Recovery expression
• Recovery expression
  {ServerName:log["C:\1c_lic_check\log.txt"].str(License check passed)}=1

• PROBLEM event generation mode = Single

-----------------------------------------------------------------------------------------


What Zabbix received and show in the Last Data:

He is doubling every string and Doesnt see the last string "Test License check test NOT passed for the following license: "052507483171100-8100454838". "
When I will add a new string Zabbix then will show string before . two times .

2019-11-01 15:16:22		License check passed for the following license: "052507483171100-8100454838".
2019-11-01 15:16:08		License check passed for the following license: "052507483171100-8100454838".
2019-11-01 15:11:52		This is test string
2019-11-01 15:11:38		This is test string
2019-11-01 15:03:22		222
2019-11-01 15:03:11		222
2019-11-01 14:55:22		License check passed for the following license: "052507483171100-8100454838".
2019-11-01 14:55:10		License check passed for the following license: "052507483171100-8100454838".