This is so weird. Tuning my guitar today with the guitar volume set on 7, then tuning the D string, the display shows A#; the G string shows C. Even just ignoring the letter and using the strobe, those two strings are not in tune. The other four strings are fine. But, when I open the guitar volume to 10 everything is back to normal. This odd behavior happens on both my strat style and P-90 guitar.
Never happened before. Any ideas?