What is the ruling on the prayers of one who performed ghusl from janabah and forgot to interlace their fingers between their toes, then interlaced them after the ghusl without intention, knowing that they repeated the ghusl at the end of the day after having prayed five prayers with the first ghusl?

We advise you, dear questioner, to abandon these whispers (waswas) and completely ignore them. Your ghusl (definition) (ritual bath) is valid, and nothing further is required of you. Interlacing the fingers (takhleel al-asabi') is a sunnah (definition) (recommended act) and not obligatory. The fard (obligatory act) in ghusl is for water to cover the entire body, and overwhelming conviction (ghalabat al-dhann) is sufficient for this. Therefore, you are not required to repeat the five prayers or to repeat the ghusl.