1st Track duplicates on 2nd track after recording 2nd track

I am new at recording guitars and vocals on audacity 2.1.2. Anyway, yesterday i started recording my Yamaha Electroacoustic guitar through a Steinberg UF-22 MK interface connected at USB port. I recorded the first track fine. However, after recording the second track to lay some fill ins on the guitar, once i playback i can notice that the 1st track duplicates on the second track and the guitar sounds like it had a phaser pedal enabled. Even if i dont play nothing on the second track, it is still recording the 1st track again on the second track (duplicating). Am i doing something wrong here?

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