No , you don’t have to pray except if you get out of the masjid.

Do you have to pray tahiyat al masjid again if you have been staying in the masjid from maghrib time to isha time?

Prayer | February 13, 2014 8:42 pm
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If one comes to the masjid late and prays 2 rakaat and the salah begins and everybody starts getting ready for congregational prayer and he still hasn’t finished tahyat al masjid should he stop his salah and pray with them or should he continue until he is done with the two rak’aat?
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Why do hanafi madhab followers pray witr 3 rakats like maghrib and do rafa yaden in the third rakah before reciting dua e qunoot,what is their daleel on this and how to explain them that this is wrong?