BO order getting split as multiple orders

Hi,

Most of my BO orders are executed as multiple orders. Eg. - If I am placing a banknifty option BO order for 150 quantity, the leg 2 and 3 of the BO order are getting placed as multiple orders of 30, 60, 15, 15, 30 quantities. This splitting of order is not uniform and every time it is getting divided in some random way. I am facing higher brokerage due to this issue. Kindly clarify this issue.

Thanks

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