Why is Star Delta Trans falling/rising?

As of 17-Sep, Star Delta Transformers Ltd's stock price is rising, currently at 632.40, reflecting an increase of 8.45 (1.35%). The stock has been gaining for the last two days, with a total return of 3.01% during this period. It reached an intraday high of Rs 642, and there has been a significant increase in investor participation, with delivery volume rising by 179.59% against the 5-day average. Despite a year-to-date decline of 30.95%, the company has shown healthy long-term growth, with net sales increasing at an annual rate of 31.81% and operating profit at 49.52%. However, it also faces challenges, such as a low return on equity (ROE) of 9.32% and recent flat results in net sales.
In the broader market context, the stock's short-term performance of +1.36% over the past week is slightly below the benchmark Sensex, which has risen by 1.56%. Over the past month, the stock has gained 8.24%, while the Sensex has increased by 2.60%. This underperformance in the longer term is notable, as the stock has declined by 18.16% over the past year compared to a minor drop of 0.46% in the Sensex. The company's low debt-to-equity ratio and attractive valuation relative to peers may support its price, but the significant underperformance in the last year and management efficiency concerns could weigh on investor sentiment.