How to remove platform catergory

[Blackstar00]

I have a category called (none) in my platforms.
How do i remove this?
When i right click on it, delete and edit is greyed out.
When i go to manage platforms it is not there.
I have never seen this before.

Edited November 23 by Blackstar00

[Blackstar00]

Never mind i found it under Options/boxes/filter side bar