Double notification messages (double-generated alert)

See attached screen shot.
I can not understand when and why this happens (there is an assumption that it is connected with the moment when the server updates the cache configuration).
Server debuglog exists and if you want I can send directly to the developers.

My config (easy to understand that in the picture, the problem is not relevant):
DEBUG

{HOSTNAME}

:

{STATUS}

|

{ITEM.NAME}

| EVENT.ID:

{EVENT.ID}

| Server timestamp =

{DATE}

{TIME}

| TRIGGER.NAME:

{TRIGGER.NAME}

***************************************************
ITEM.VALUE1:

{ITEM.VALUE1}

ITEM.LOG.EVENTID1:

{ITEM.LOG.EVENTID1}

ITEM.LOG.SOURCE1:

{ITEM.LOG.SOURCE1}

ITEM.LOG.AGE1:

{ITEM.LOG.AGE1}

***************************************************
ITEM.LASTVALUE1:

{ITEM.LASTVALUE1}