Tuning Problems with KORG Green Light

This is a 2.083 minute video response from Nick Greathouse on Nov 1st, 2008

Question:

"fuyu asks, "Hello! I just finished watching Lesson one and watched the video about tuning twice. I also have looked through all the current replies regarding tuning but had no luck finding an answer. I just bought my first guitar a week ago, and I have no clue if this is supposed to happen. When I tune my guitar on my KORG tuner, the LCD arm that tells me it's on tune with the green light -- but the arm also flails to the sharp and flat red lights especially when I try to tune my 5th and 6th string. Is there something wrong with my guitar? I have held tried muting the other strings while I tune a string, and it helps on the first 4 strings, but the 5th and 6th go between the green light and swings to the sharp and flat red lights as well while tuning (the light remains green in the middle however). Is this normal?""