Must a Muslim repeat his prayer if he doubts his sitting (whether it is for the Tashahhud or between the two prostrations), then assumes the minimum and considers it the sitting between the two prostrations, and when he is about to perform the second prostration, it becomes clear to him that he has completed the two prostrations, so he returns and completes the Tashahhud and salutes, then performs the two prostrations of forgetfulness, knowing that he frequently experiences forgetfulness and doubt?

If one doubts in their prayer whether they performed one prostration or two prostrations, or doubts the number of rak'ahs, the principle is to build upon the minimum certainty and complete their prayer, then perform the prostration of forgetfulness (sujud al-sahw). They should not build upon what they predominantly assume, according to the majority of scholars. Some scholars hold that the worshipper should strive for correctness and act upon what they predominantly assume, then perform the prostration of forgetfulness after the taslim. This is the choice of Ibn Taymiyyah and Ibn Uthaymeen. As for one who experiences frequent doubts, they should not pay attention to them and should build upon the maximum number.