[AX 2012 R3] WMS On Hand Explanation

Hi,

Can someone help me explain how this is happened?

3HPIC01 is my packing location. 3HPRO01 is production output location (without license plate controlled, so we can assume the same as bulk location without license plate controlled). If we sum all physical inventory and deduct it with physical reserved, we will get available physical. What I don't understand, where 4 available physical is stored? 3HPIC01 or 3HPRO01? How do I explain on-hand if the situation is above?

Thanks.