cron.daily runs twice

Since setup of my system (actual 2.2.10) in December 2015 cron.daily runs twice every day.
First run around 4:00 am and second run around 4h later.

root@omv1:~# cat /etc/anacrontab
# /etc/anacrontab: configuration file for anacron


# See anacron(8) and anacrontab(5) for details.


SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
HOME=/root
LOGNAME=root


# These replace cron's entries
1       5       cron.daily      run-parts --report /etc/cron.daily
7       10      cron.weekly     run-parts --report /etc/cron.weekly
@monthly        15      cron.monthly    run-parts --report /etc/cron.monthly
root@omv1:~#

Email Notification at first run:

CRON-APT completed on omv1 [/etc/cron-apt/config] [omv1.local.lan]

Zitat

CRON-APT RUN [/etc/cron-apt/config]: Tue Oct 18 04:00:01 CEST 2016
CRON-APT SLEEP: 1111, Tue Oct 18 04:18:32 CEST 2016
CRON-APT ACTION: 3-download
CRON-APT LINE: /usr/bin/apt-get -o Acquire::http::Dl-Limit=25 dist-upgrade -d -y -o APT::Get::Show-Upgraded=true
Reading package lists...
Building dependency tree...
Reading state information...
The following packages will be upgraded:
libsystemd-login0
1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 29.6 kB of archives.
After this operation, 0 B of additional disk space will be used.
Get:1 http://security.debian.org/ wheezy/updates/main libsystemd-login0 amd64 44-11+deb7u5 [29.6 kB]
Fetched 29.6 kB in 1s (25.3 kB/s)
Download complete and in download only mode

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Notification at second run:
CRON-APT completed on omv1 [/etc/cron-apt/config] [omv1.local.lan]

Zitat

CRON-APT RUN [/etc/cron-apt/config]: Tue Oct 18 07:35:01 CEST 2016
CRON-APT SLEEP: 2384, Tue Oct 18 08:14:46 CEST 2016
CRON-APT ACTION: 3-download
CRON-APT LINE: /usr/bin/apt-get -o Acquire::http::Dl-Limit=25 dist-upgrade -d -y -o APT::Get::Show-Upgraded=true
Reading package lists...
Building dependency tree...
Reading state information...
The following packages will be upgraded:
libsystemd-login0
1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/29.6 kB of archives.
After this operation, 0 B of additional disk space will be used.
Download complete and in download only mode

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Has anybody an idea, why cron.daily is running twice per day?