Asterisk Queue Log Problem

I have a Queue and in the queue_log there are always 2 Entries for a Caller entered an empty queue.

Is this normal?

34 2015-01-20 09:48:05.612875 1421743678.9806 sales NONE EXITEMPTY 1 1 0 33 2015-01-20 09:48:05.611030 1421743678.9806 sales NONE EXITEMPTY 1 1 0

Asterisk Version 11.6.0-rc1

queues.conf

[queue_template](!) strategy=ringall ; ring all available channels until one answers (defaul$ leavewhenempty=yes ; don't leave the queue no members available joinempty = yes ringinuse=no ; don't ring members when already InUse announce-frequency=60 ; Alle 60 Sekunden Position durchgeben timeout= 30 ; Timeout nach 30 Sekunden retry = 1 ; maxlen = 1 ; maximal 6 wartende + 1 aktiv announce-holdtime = no