Price difference generated after GR reversal

Hi Gurus,

Issue: Price difference generated after GR reversal

Here we have confirmed an operation of a Production order & few minutes later cancelled the same.But after the cancellation it is found that some amount is always hitting to price difference account.

Can u pls tell me why such thing are happening?

Is it normal or some setting is missed in configuration?

Thanks & Regards,

Gouranga