Developers can delete files in Gitlab CE Edition

Hi, This is kamal Chouhan as I am a new user here and posting a issue.

Recentlly I have installed Giltab in our Domain and it is working smoothly but there is a BUG/Issue in that If I assign Developer permission to user he is able to delete others files as well own. It is very insecure to manage.
Kindly suggest if it is known issue.

Regards,
Kamal Chouhan