ANSWER: No, this is not valid as you have missed a pillar which is standing with the imam after rising up from ruku.

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ANSWER: The best is to sit in the same spot and do your adkhar but you’re not sinful if you change the spot.

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ANSWER: It’s valid.  Isha (4 rakah) is valid and witr is not part of isha. https://youtu.be/ny73kP0XSSs

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