The tool path is following the outline of the text instead of creating a path following the centerline of the character.

Solution
Select the "Note" in the graphics screen and edit the "Settings" of the "Note".

Instead of using a font that has a width to the characters, choose "blockfont".

The "single" sided path is seen below.

Hardware/Software Configuration
Platform: INTL64
OS: windows
OS Version: 1064
Product: NX
Application: CAM
Version: V1876
Function: PLANAR_MILLING
Ref: 002-8014936