Curious case of Courgettes! !

Just wondering if anyone knows or notice, some packets have 2 and some have 3 Courgettes, printed same freaking weight on packets, 500gms. But while weighing its not same.

Is it packaging fault? Or it's just how it goes. I don't know who are buying 2 of them for the price of 3. But they are all gone by the end of the shift.