Can't change average cost per share for company mergers

I’m fairly new to this. I’ve been following the instructions with how to upload holdings but have a problem with entering GXY/ORE/AKE.

The merge function allows me to manually enter the Market price of the cancelled holding but I can’t change the Average cost per share of the new holding. Sharesight has it at $8.28 p/share while my statement has it as $8.81733598 p/share.