A round is a journey from Al-Safa to Al-Marwah and coming back again to Al-Marwah is another round

Q 1: I have performed the obligation of Hajj, all praise be to Allah. But due to my ignorance during Sa`y (going between Safa and Marwah during Hajj and `Umrah), (Part No. 10; Page No. 269) I started my Sa'y with Al-Safa and finished it there. I counted these two rounds as one round and I did this in the seven rounds. After I came back from performing Hajj, one of my friends told me that a round is a journey from Al-Safa to Al-Marawah, and coming back again to Al-Marwah is another round. My question is: Is there any sin on me because of this mistake, and what should I do? May Allah reward you with the best.

A 1: Your Sa'y is valid, your addition to the rounds of Sa'y is an excusable mistake because it was done out of ignorance. But you should not do this again.May Allah grant us success. May Peace and Blessings of Allah be upon our Prophet Muhammad, his family and his Companions!