Season's greetings all!!!

I've just finished a song in BIAB. It is in the key of C. My problem is that when the chords change to G, the G sounds out of tune... I want it to sound like a G major. There are other G's used in the song and they sound right. It's just one change in the middle of the song. Is there a setting to stop BIAB from using these "out of tune" chords?

Much appreciated!!!

/Bobby