Using deploy key with Slack Notifications returns admin username


So I have a project that has a webhook to Slack Notifications to trigger on all pushes.

When using a deploy key created under “/admin/deploy_keys” this particular “Public deploy key” has been granted write access back to the project/repo.

The problem is when the deploy key is used to commit back to the project/repo the Slack Notifications result in:

'Administrators Username' pushed to branch master of Engineers/db_project (Compare changes)
ddac0882: Eng-8384 - change of folder names #2
- Jenkins Build User

Where ‘Administrators Username’ results in my Name being displayed.
But I didnt commit the change, nor is the SSH key under any of my keys - It is a central deploy key

How can I change the username displayed in these Slack notifications?