cronjob runing twice debian stretch

[<gro.naibed@lagelagelage.ch>]

Hello


Does anybody know why we have to entries in our process list of the same cronjob?



We run as root: "ps -aux"

Result:
...
root     21514  0.0  0.0  48824  2692 ?        S    10:28   0:00 /usr/sbin/CRON -f
root     21517  0.0  0.0   4276   796 ?        Ss   10:28   0:00 /bin/sh -c php /var/www/html/bin/console Mailings --env=dev
root     21519 87.4  0.2 394200 121872 ?       R    10:28   1:11 php /var/www/html/bin/console Mailings --env=dev
...
root     21540  0.0  0.0      0     0 ?        S    10:28   0:00 [kworker/u66:1]
root     21545  0.0  0.0  48824  2692 ?        S    10:29   0:00 /usr/sbin/CRON -f
root     21548  0.0  0.0   4276   792 ?        Ss   10:29   0:00 /bin/sh -c php /var/www/html/bin/console Mailings --env=dev
root     21550 78.7  0.1 363480 89840 ?        R    10:29   0:18 php /var/www/html/bin/console Mailings --env=dev
...




The cronjob-file:
* * * * * php /var/www/html/bin/console Mailings --env=dev

There ist only one entry in the cronjob-file and the cronjobfiles from other users are emtpy.

We use the follow debian version:
Distributor ID: Debian
Description:    Debian GNU/Linux 9.8 (stretch)
Release:        9.8
Codename:       stretch



Thank you a lot