Why is AVI Polymers falling/rising?

As of 21-Jul, AVI Polymers Ltd is experiencing a price increase, currently at 17.84, reflecting a rise of 0.46 or 2.65%. The stock has shown strong performance recently, gaining 13.05% over the last three days and outperforming its sector by 2.12% today. Additionally, the stock has positive returns over various periods, including a 12.98% increase over the past week and a 42.61% rise year-to-date. However, there is a noted decline in investor participation, with delivery volume dropping by 24.53% against the five-day average, which could indicate a potential concern for future momentum.
In the broader market context, AVI Polymers has significantly outperformed the Sensex, which has seen a slight decline of 0.06% over the past week. The stock's year-to-date performance of 42.61% contrasts sharply with the Sensex's 5.20% increase, highlighting its strong relative strength. Despite the recent gains, the falling delivery volume suggests that while the stock is currently rising, there may be underlying issues that could affect its sustainability in the near term.