Start by displaying the guidance again as top Layer. When going to the Mapping screen go to the bottom section and click the Layers Tab. This will give 3 boxes from the middle box called View, you should have an attribute called Name. Highlight this attribute and see what the Legend box to the right is showing for the line names? If they are exactly what you named each line - then I do not believe the issue is with the desktop software. Sounds like it could be a setting on the TMX. Can I assume you are using the FMX + app on the TMX? Of so, try exporting the guidance lines with Trimble/FMX display to a clean USB and see what happens. The FMX +on the TMX uses the same AgGPS folder as the FMX.