I think you don't really understand how it works but I'll try to make it simple.
My account has a ballance of 1729.19 and was already withdrawn 514.83 what makes a total of 2244.01.
The total deposits were 1274.82 what means that I made a profit of (2244.01 - 1274.82) 969.30.
But some investors started at the beggining of the account what means that they had their profit sooner and that doesn't count in the actual share.
The account is not splitted by equal to every investor, because it would be unfair for a $1000 investor have the same profit of a $300 investor, so let's imagine that we have a 50% profit in a month only with those two investments:
For a $1000 investor
$1000 x 50% = $1500 / The investor have a profit of $500 - 35% (trader fee) having a gross profit of $375
For a $300 investor
$300 x 50% = $450 / The investor have a profit of $150 - 40% (trader fee) having a gross profit of $90
So, every investor is a part of the same account, but each one of them have their profits individually.
The percent share of the account it is only to know your split, so you know that all of that is yours andd you don't share from the others funds.
Hope I could make it clear for you, please feel free to make your questions.