Was Bukhari, Muslim, An-Nasa'i, Tirmidhi, Ibn Majah Shafi'is?

I have important Q, I always thought that Bukhaari, Muslim, An-Nisa’ee, Tirmidhi and Ibn Majah were Shafi’ee, some1 gave me an article by troid sayin they didnt follow a madhab, please shed some light on this.

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