Paintscraper
Well, What I mean is everything is playing back in mono. I see that you can select mono or stereo on the master.
I panned it to check and there is nothing on the right side at all.
This is exactly what Dave was trying to tell you.
You don't have a mono track, you have a stereo track with the guitar on the left and silence on the right.
To record a mono track (which will be centered in the stereo field), select the Left input as mono, and set the stereo interleave (looks like a bowtie) in the track to mono.
This will give you a track that you can move in your stereo field.
Also, it's best not to use the Realtek with your Line6 interface. This will cause you lots of problems.
Set everything to the Line6.