How to put a Spot Trailing stop sell order ?

Hey.
I'm making an attempt to place an trailing stop promote order on spot, but I don get it.
This explanation could be very dangerous. The image could be very confusing (to me... ).

I'll try to make an instance of my drawback .

Suppose that the current worth of ETH is 3950 usdt.

I put the order with this parameters:

Restrict: 3850
activation: 3820
trailing delta: 1%

On this case, appears a promote order at 3820. This order shouldn't be shifting.

What I'm doing incorrect?

Thanks.