Why is Cummins India falling/rising?

As of 19-Aug, Cummins India Ltd. is experiencing a decline in its stock price, currently at Rs 3,750.00, reflecting a decrease of Rs 34.2 or 0.9%. The stock has underperformed its sector by 0.33% today and is 4.71% away from its 52-week high of Rs 3,926.6. Over the past week, the stock has seen a slight decrease of 0.16%, while it has performed better over the past month with a return of 6.31%. Despite strong long-term fundamentals, including a healthy average Return on Equity (ROE) of 20.76% and significant growth in net sales and operating profit, the stock is currently facing pressure due to a very expensive valuation and a high Price to Book Value ratio of 13.7. Additionally, a notable drop in investor participation, with delivery volume falling by 48.35% against the 5-day average, may be contributing to the stock's recent price movement.
In the broader market context, the Sensex has increased by 1.76% over the past week, contrasting with Cummins India's slight decline. While the stock has shown strong performance over the longer term, with a 206.10% increase over the past three years, its recent performance has not kept pace with the benchmark index. The company's high institutional holdings at 40.14% indicate confidence among larger investors, but the stock's premium valuation compared to peers may be causing caution among retail investors. Overall, the combination of high valuation concerns and reduced trading activity appears to be influencing the stock's current downward trend.