What you are doing is correct. One must only pray one Witr in one night.

I pray 3 witar in isha prayer and then I wake up for thahjad night prayer and I pray 2 and 2 but I don’t pray 1 witar after that because I prayed 3 witar in isha prayer is this correct or should I pray the 1 witar after thahjad prayer?.

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