Why is Envirotech Sys. falling/rising?

As of 18-Sep, Envirotech Systems Ltd is experiencing a price increase, currently at Rs 165.00, which reflects a rise of Rs 3.0 or 1.85%. The stock is trading close to its 52-week high, being only 4.85% away from Rs 173. It has outperformed its sector by 1.45% today and is trading above its 5-day, 20-day, 50-day, 100-day, and 200-day moving averages. However, there has been a notable decline in investor participation, with delivery volume dropping by 65.24% against the 5-day average, indicating a potential concern for sustained momentum. The stock has shown strong performance over the past month, with a return of 14.19%, significantly outperforming the Sensex, which returned 2.20% in the same period.
In the broader market context, while Envirotech's recent performance is strong, it has lagged behind the Sensex in the past week, with a return of 1.04% compared to the Sensex's 1.67%. Year-to-date, however, Envirotech has significantly outperformed the benchmark, with a return of 34.64% against the Sensex's 7.52%. This suggests that while the stock is currently rising, the decline in investor participation could pose a risk to its upward trajectory if not addressed. Overall, the stock's positive short-term performance is supported by its strong returns relative to the benchmark, despite the recent drop in trading volume.