Why is Envirotech Sys. falling/rising?

As of 19-Sep, Envirotech Systems Ltd is experiencing a decline in its stock price, currently at 153.80, which reflects a decrease of 11.2 points or 6.79%. The stock has underperformed its sector by 6.1% today, and while it is trading higher than its 20-day, 50-day, 100-day, and 200-day moving averages, it is lower than its 5-day moving average. Additionally, there has been a notable drop in investor participation, with delivery volume on 18 September falling by 33.33% compared to the 5-day average. In terms of returns, the stock has shown a 1-week decline of 1.85%, but it has performed positively over the past month with a 6.33% increase and a year-to-date return of 25.50%. There is no information available regarding positive or negative factors impacting the stock.
Broader market context indicates that while Envirotech Systems Ltd has underperformed in the short term relative to the benchmark Sensex, which has gained 0.85% over the past week, the stock's longer-term performance remains strong with a year-to-date return significantly surpassing that of the benchmark. The Sensex has only increased by 7.11% year-to-date. This suggests that despite the recent decline, the stock has been resilient over a longer horizon, but current market conditions and reduced investor activity may be contributing to the recent price drop.