As the Talmud is, at its core, an oral tradition—with the words before us a summary of “classroom”” discussion—it is not surprising that debates will occur as to what the “teacher” actually said.
When making reference to biblical verses, we tend to identify them by chapter and verse. This most convenient system is of non-Jewish origin and occasionally deviates from the division of texts as understood by our Sages. While one might be tempted to say that a more traditional approach would divide the text according to parshat hashavua (the weekly Torah reading cycle), that, too, is of later origin. Our division into 54 parshiot was only finalized in the middle ages, hundreds of years after the close of the Talmudic period.