Can you explain me why i have a difference about the
volume when the trade are copy in my Mt4 with a trader who i have a Subscription. All my volume stay always in
You don't have the same account balance, have you?
The copying ratio is calculated by taking in mind account balances and leverages.
You are taking too much risk by copying a signal provider with 10 times your balance and opening 1/4th of his/her trades (because you can't open smaller trades).