MNGLG quantity is doubling then MENGE quantity

Dear Guru's,

we have created a BOM for costing i.e. BOM Application PC01

but for all the part numbers the BOM quantity(MENGE) and Quantity(MNGLG) are same

but only few material codes i am getting both the quantity's are different, so here my concern was why it was happens like this

is there any formula to calculate MNGLG quantity based on UOM or any other thing

please help to understand the calculation

Regards,

Venkatesh..