Scale Bar Scale Ratio does not match Viewport

[mwilliamsK3SDE]

When I go to Layout Tools > Scale Bar > Select Built-In > Click Viewport

The Scale Bar Ratio does not match the Viewport Exactly. This starts providing scales larger than 1"=50' with a 0.0001 at the end. I have tried everything to fix. Please help.  

[paullimapa]

sounds like an AutoCAD Map question which may get better feedback here:

AutoCAD Map 3D Forum - Autodesk Community

[cadffm]

CIVIL3D!

[TheCADnoob]

Have you changed your units since adding the scale bar? If so try reading the scale bar.