A hadith like this has been narrated on the authority of Qatada with the same chain of transmitters by different narrators (except this difference) that in the hadith transmitted by Taimi and Umar bin Amir and Hisham (the date of setting out is) 18th, and in the hadith transmitted by Sa'id it is the 12th, and in the one transmitted by Shu'bah it is the 17th or 19th.
Shaykh Maulana Abdul Aziz Alvi
Hadith Commentary:
Note: There is no contradiction in these hadiths because in all these dates, the Prophet (sallallahu alayhi wa sallam) was on a journey, as he departed from Madinah on the 10th of Ramadan. After that, he remained on the journey for the entire month of Ramadan.
Source: Tuhfat al-Muslim: Commentary on Sahih Muslim, Page: 2616