Q: I create a Ea in Fsb, this is converted into an MT4 format if this Ea is transmitted in Mt4. If this Ea now calculated in Mt4 ?
A: Yes, if you load up the EA in the mq4 format in MT, every calculation is done in MT.

Q: If so, why do I need a connection to Fsb?
A: You don't need a connection when using exported EAs. If you use FSB's Trader, then you have to connect Trader to MT.

Q: If the Ea running on my MT4 account is calculated in Fsb, would have the same results as in the preparation of Eas in Fsb come out right ?? , But in my case is not the case, and not only for this Ea. What is wrong ??
A: Profitable backtest doesn't guarantee similar future returns. In the development phase you have to verify if the results are meaningful or just random luck or curvefitting.

Q: If the Ea is transmitted only by Fsb and is calculated only in Mt4, I can not rely on Fsb because Mt4 might make a different calculation.
A: This should not be the case. I have worked through the Supertrend indi and found the culprit. I'll make the necessary changes to fix this issue.

One last note - don't worry about asking "stupid" questions, that's what this forum is about. After all, every wise man knows himself to be a fool, like the old saying goes.