Why is buy average price of some purchase shares is shown incorrect in the comet?

Why is buy average price of some purchase shares is shown incorrect in the comet?

Usually, the buy average at Jainam is determined using the FIFO method. However, in cases of corporate actions as bonus shares, splits right issue, Demerger etc. Jainam updates the adjustment for such corporate action once they are completed on the basis of all the relevant information provided by the company or exchange.