If a person forgets something while offering Salah behind the Imam, what he should do

Q 5: Some Imams (those who lead the congregational Prayer) do not change the tone of their voices - when they say the Takbir ("Allahu Akbar [Allah is the Greatest]") before sitting for the Tashahhud (a recitation in the sitting position in the second/last unit of Prayer) - from the usual tone that they use in the other utterances of Takbir. As a result, some of the Ma’mums (persons being led by an Imam in Prayer) stand up while the Imam and the other Ma’mums remain in the sitting posture, so they sit down again. Do they have to perform Sujud-ul-Sahw (Prostration of Forgetfulness) after the Imam and the Ma’mums say the Taslim (salutation of peace ending the Prayer), because they made a mistake and stood up when the Imam remained seated?

A: The Ma’mums do not have to perform Sujud-ul-Sahw if they do something mistakenly while praying behind the Imam, unless they come late and miss some of the congregational Salah (Prayer), as the Imam assumes the responsibility for them for Sujud-ul-Sahw.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.