In the order that you indicated as an example, the delivery method is not indicated:
https://prnt.sc/u4vmci, therefore it is not added to the total amount of the process. Also, the delivery methods you have created have a price of 0
https://prnt.sc/u4v3wl so even if you specify a method, the cost will be 0. You need to specify the delivery method, its cost and check the box that you were recommended to set earlier: https: //prnt.sc/u2qauc so that the delivery amount is added to the process. In this case, in the BP, return the formula that was earlier, that is: [suminorder] - [predoplata2] . Then the total amount should be calculated correctly. Make these settings, test and give feedback, please. Thank you.