The Imam offering Sujud-ul-Tilawah while the Ma'mums do not noticing that

Q: The Imam (leader of congregational Prayer) made Sujud-ul-Tilawah (Prostration of Recitation) but the people offering Salah behind him did not pay attention to that. Then some of them made Ruku‘ (bowing) without following the Imam in Sujud-ul-Tilawah and did not know until the Imam rose from the prostration pose, thus they added a Ruku‘ to Salah. What is the ruling on that?

A: If the reality is as mentioned, the wrongly-made Ruku‘ of some people offering Salah behind the Imam, when the Imam made Sujud-ul-Tilawah, is insignificant; they have to follow their Imam. So, if they can follow him in Sujud-ul-Tilawah, they should do so. Otherwise, they should follow him in standing then Ruku‘, and their Salah is valid.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.