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.

Kamal Chouhan