How match fields in contract and receivables invoice?

When create a contract with many lines are create the contract invoice and transfer to receivables the fields quantity and unit price are change, i create one lines with quantity 1500 and unit price 1 but when the invoice are in receivables the invoice have quantity 1 and unit price 1500.

I attach screenshot with and example how the fields are change

Contract with unit price 1 MXN

Invoice with unit price 89,378.01 MXN