Yazid bin Ruman (may Allah have mercy on him) says that in the time of Sayyiduna Umar (may Allah be pleased with him) the people used to perform the night prayer of Ramadan with 23 rak'ahs.
The reconciliation between the two narrations is that at first they used to pray eleven rak'ahs in the night prayer, then they began praying twenty rak'ahs, and at the end they would pray three rak'ahs of witr.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4618