After doing a lot of research I understood that the P&L is not to trust! The Total Account Value is much less than the P&L. If I add P&L to the initial sum I deposited does not match on the overall Total Account Value.
This is because the P&L amount does not cover the following:
1. Buy/sell Fees (10£) for each trade
2. Exchange rate fees ( 0.5%) for each trade
3. Exchange rate movement GBP/USD
4. The most important, and in my opinion hidden one, is the spread when you buy/sell stocks. This is for normal Share dealing accounts also. The spread explains where the majority of the money gets taken. On a 14% profit half of it (7%) is gone in Fees and especially on the spread above.