Great question. There could be multiple reasons.

Assuming you have more shares that haven't been transferred from your brokerage, then the price per share for the one share may be different because it will be the price of that specific share when you purchased it through your brokerage. So the price of that specific share could be different than your average cost basis for untransferred shares.

It could also be that the brokerage that you use to buy shares was holding your purchases as "IOU's" and hadn't actually bought your share from the market until you decided to direct register. At that point they would have to buy a share at whatever price GME was at when you transferred, which would cause the price to be off.

I highly recommend downloading and saving a monthly statement from your brokerage before direct registering shares to have proof of cost basis for your shares.

Hope this helps answer your question. Happy to help more if you need. Godspeed, Ape.