Hi Cmeed,
That looks more like a UV error more than anything else. Can you post a screen shot of your UV image for channel 1 and channel 2? When viewing in the mesh editor window make sure that the UV button is selected in the toolbar to show them along with your mesh.
Depending on how the lights are setup here and UV that was generated by UE4 (not the best solution because it can be wonky) Also depending on how the texture is laid out coule cause the line/stretching on the right hand side.
If you are having trouble still, you can always upload your asset here and I will take a look and give you direct steps on what needs to be done or you can create an asset that does the same thing for me to give you guidance on.
Thank you!
Tim