"Insignificant results" in strategy tester

[Forex Trader]

I have an EA, and I run it 3 times, each with a different value for StopLoss, say 5, then 10, then 15. I get different results, as expected: amounts of $700, $800, and $1700 for example. When I run it with the optimizer, however, and put in a Start value of 5, a Step of 5, and a Stop of 15 for the StopLoss parameter, I would expect to get the exact same values as when I ran it three different times. I do not, however. Even more puzzling is the fact that there is nothing in the Optimization Results or the Optimization Graph tab, and in the Journal tab it says although it was run 3 times (which is the correct number, of course) the results are "insignificant". Well, they are not insignificant when I run them one by one, so what am I missing here?