I assume you are referring to the fact that the word appears twice: at the beginning of the question (line 23), and again at the end of the question (line 23). This seems to simply be a result of the length of the question; because a supporting Diyuk was necessary to base the question, the train of thought would have been lost without the second Menalan. (The Dikdukei Sofrim does not change the Girsa.) Rebbi Yochanan then answers th e question.

M. Kornfeld