My indicator hehavior is different from use it in the cbot, which cause diff trades

Hi

pls see screen attach here, my indicator give trades oppotunitie.

But at the same time, my cbot who use same indicator with same paramters do not give these signals.  i would like to know this behavior is by design or a bug.  

I think data feed to cbot and indicator is different,  so this behavior is by design, but it's a little confuse and unconvenient to test cbot, because i'd like to check my cbot trades with indicator on screen.

why i think the behavior is by design:

1. Calculate is called once for every historical bar and on every tick for the current bar.
2. OnBar is called once every time a new bar is opened.

Pls let me know if my understand is rignt, if not i will dig into my code and find bug.