Please, kindly be informed that an Investor does not copy the number of lots of the Trader’s order.
The 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 the coefficient calculated as Investor’s funds divided by Trader’s funds. Thus, Trader's profit multiplied by this coefficient is your profit.