System Information
Operating system: Windows 7
Blender Version
Broken: (version 2.80, Hash: e78770039397, Branch: blender2.7, Date: 2018-05-20 22:03
Short description of error
1px has the same thickness as 2px in Outline Width under User Preferences > Themes > 3D View > Outline Width.
Exact steps for others to reproduce the error