Why is Star Delta Trans falling/rising?

As of 12-Sep, Star Delta Transformers Ltd is experiencing a decline in its stock price, currently at Rs 618.90, which reflects a decrease of Rs 6.05 or 0.97%. Today's price summary indicates that the stock opened with a gain of 2.81% but subsequently fell, reaching an intraday low of Rs 610. The stock has underperformed its sector by 1.33%, and the volume traded has decreased significantly, with a delivery volume drop of 17.83% compared to the 5-day average. Over the past year, the stock has generated a return of -19.20%, which is substantially worse than the broader market's performance, indicating ongoing challenges despite some positive long-term growth metrics such as a 31.81% annual increase in net sales.
In the broader market context, the stock's recent performance contrasts sharply with the Sensex, which has gained 1.48% over the past week and 2.08% over the past month. While Star Delta Transformers has shown impressive long-term growth with a 402.15% increase over three years, its recent performance has been hampered by poor management efficiency, as indicated by a low return on equity of 9.32%, and disappointing quarterly results that showed a significant drop in net sales. These factors contribute to a lack of investor confidence, leading to the stock's current downward trajectory amidst a generally positive market environment.