Does the prayer of one who mistakenly recites "the path of those upon whom You have bestowed favor" out of ignorance become invalidated, then discovers the error and corrects it, but sometimes forgets and reverts to the old mistake?

If the error in reciting Al-Fatiha is replacing the letter ط (ṭāʾ) with ظ (ẓāʾ), it is considered a clear grammatical error (laḥn jalī) that changes the meaning and invalidates the prayer according to the majority of scholars. The prayers performed with this error must be made up. As for the Malikis, they hold that unintentional grammatical errors do not invalidate the prayer, even if they occur in Al-Fatiha. Furthermore, Shaykh al-Islam Ibn Taymiyyah is of the view that there is no obligation to make up prayers for someone who unknowingly omitted a pillar of the prayer, but making them up is more cautious to avoid scholarly disagreement.