What is the ruling on the prayers I performed without firmness ( عدم الاستقرار ) in their pillars, and must I repeat them?

The cure for obsessive thoughts (waswas) is to ignore them and not pay them any mind. It is permissible for someone afflicted by waswas to avail themselves of some concessions to make things easier for them, such as adopting the view of the Malikis that tranquility (طمأنينة) in prayer is a Sunnah. Therefore, the prayers they have performed are valid, and they do not need to repeat them.