Why is Bharti Airtel PP falling/rising?

As of 18-Sep, Bharti Airtel Ltd Partly Paidup is experiencing a slight decline in its stock price, currently at 1,480.00, reflecting a decrease of 2.0 points or 0.13%. The stock has fallen after two consecutive days of gains, and while it is trading above its 5-day, 20-day, 50-day, 100-day, and 200-day moving averages, there has been a significant drop in investor participation, with delivery volume on 17 September falling by 76.59% compared to the 5-day average. Despite this decline, the stock has shown strong performance over various periods, with a year-to-date return of 25.66% compared to the Sensex's 6.24%, indicating robust long-term growth.
In the broader market context, the stock's performance over the past week has been positive, with a return of 1.40%, although this is slightly lower than the Sensex's return of 1.80%. The overall market appears to be performing well, as evidenced by the Sensex's gains. However, the recent drop in Bharti Airtel's stock price, despite its strong historical performance, suggests that current market dynamics and reduced trading activity may be influencing investor sentiment negatively, leading to the observed decline.