Please, kindly be informed that Investor does not copy the amount of lots of the Trader’s order.
Investor copies the financial part of the Trader's order to get more precise copying. This way there is no need to wait for Investor's order closure, during which the price can change and, consequently, the PnL too.
Investor’s profit in this case depends on coefficient calculated as Investor’s funds divided by Trader’s funds. Thus Trader's profit multiplied by this coefficient is your profit.