Overnight news or global market moves often cause Indian stocks to open with a significant gap. A large gap causes the bands to instantly expand, which can distort standard deviation metrics on lower timeframes. If a stock gaps open far outside the upper or lower band at 9:15 AM, avoid chasing it immediately. Wait 15 to 30 minutes for price action to settle, as prices frequently pull back toward the 20 SMA middle band to fill the opening gap.