Calculation of the price at the rate

Order https://farfor.crm-onebox.com/admin/customorder/issue/10289/edit/ Costs the course of the process euro 95 System rate euro 90 There is a product, the price is 40 euros https://farfor.crm-onebox.com/admin/shop/products/307882/edit/ I add a product through the search block, writes 3600 - this is at the rate of 90, that is, at the system rate, not the process. Then I change the course of the process to 90 and the price became 3410. If you recalculate this course 85 Recorded video attached. 1. Why is the price in the process in the search block displayed at the rate of the system, and not the process? And how to fix it 2. Why did the price become 3410, if you calculate at the exchange rate, then such a price could not be different. Should be at the rate of 90 system or 95 process