Welcome to the forums :)
My guess is you are recording using one microphone through one input (MONO).
However, your track is set to record from input 1-2. This means input one would be L signal and input 2 the R signal...
Make sure the Input source is set correctly. i.e. if you are using one microphone to record voice or guitars then that is a mono source, so set the Input Source in the Track Info pane appropriately.
Let me know if that helps :)