Good day.
The issue with RTC probably arose because of the "If RTC is available, put it in the sales price" check box. If it is taken away, according to the RRC price calculation rule, if it is available, it will be substituted into the sales price (taking into account rounding rules, currency data, if any)
When running "Recalculate the price and view the detailed recalculation log", the system calculates the price correctly -
https://i.imgur.com/3LcilMJ.png