Hello Adithya,
There can be many reason for this but primarily what drives is your Price control. For eg if you have standard price in material master in case whatever is PO price or stock moment will happen at standard and difference between Standard Price and Moment price will hit to PPV.
Secondly its always recommended to check Standard price of material master, although its is within same company code but still they will be two material master, since material master are per plant.
I have observed case where company was hitting P&L by stock transfer since standard price were drastically different
Hope this helps
Thanks