I did not prostrate with the Imam and many of the worshippers at the verse of prostration.

Scholars differ concerning the ruling on the prayer of a congregant who does not follow his Imam in the prostration of recitation (Sujud al-Tilawah). Some are of the view that it does not invalidate the prayer because the prostration of recitation is not among the actions that must be fundamentally emulated. Others are of the view that it invalidates the prayer, based on the Prophet's (peace be upon him) saying: "And when he prostrates, then prostrate." The more cautious approach is to repeat the prayer in question, unless the lack of following was due to an excuse, in which case the prayer is not invalidated.