Bug when creating new Sales Order

I am trying to create a new Sales Order with Rest API but the data entered are different from the ones I pass as parameters.

So to be more clear, I created a new Sales Order, entered the data. And the data were entered successfully.
Until now everything’s good.
I try to create new Sales Order, and the entered data in the ERPNext are the previous ones.

This the code that I have:

And these are the data that I pass:

I hope I was clear with my explanation.