Katello agent causes duplicated outputs in yum


With last two version of katello agents i have been experiencing weird problem:

Duplicated outputs of: “Loaded plugins: fastestmirror, langpacks, product-id, subscription-manager”

Do you have any suggestions what should be wrong or what logs should i check?
This is most likely caused by katello-agent because when i uninstall it this bug disappears.
This happens in both Centos 7 and Centos 6.

Current versions:
Foreman: 1.19
Katello: 3.8
Puppet: 4
Agent: 3.3.5 (as seen in picture)