Help with Optimization

Hello Every one,

I do perform optimization, but every time the profitability line at the optimization graph will drop down heavily at the end of the optimization, can some one kindly advise why does this happen? and is that normal?

Thanks in advance for your support
Regards

Below is the testing results I keep getting, it is always the same, a large drop near the end

Can't any one kindly explain why this is happening ?

Is there any thread explains the optimization ? it always collapse near the end.

This is another graph

MT closes all orders at the end of the back test, you may have some big losers outstanding, a quick glance at the results tab in the back tester may be enlightening.