@Ankit Rathod Firstly, apologies for the delay in responding on this and any inconvenience this issue may have caused
I had multiple discussion internally and got confirmation that there is an error in the calculator as pointed out by you in your query.
Our internal team has filed a bug and is working on it. I dont have an ETA on this right now but rest assured it is in their priority list and they are trying to fix it as soon as they can :)
Hope it helps!!!
Please 'Accept as answer' if it helped, so that it can help others in the community looking for help on similar topics