Answer:
(Fatwa: 380/300/B=1434)
The hadith of 12 takbir is weak while the hadith of 6 takbir is strong. Ahnaf follow strong hadith. If you want to know more about it, you should study E’la al-Sunan and Bazlul Majhood.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
