I don't get it, what are you expecting/trying to do?
If you record mono on a mono track, you're supposed to hear everything in mono/ the middle, or you can pan the mono signal to left or right. If you record mono (like guitar or vocals) on a stereo track, you only get signal on one side, and you can not pan it in a similar way as a mono track. Stereo recording requires two signals. Also, if you have two identical signals on both channels of stereo track, that is the same as mono.