The certification by the Clerk of the sufficiency of a referendary petition within thirty (30) days after passage of the ordinance to which such petition refers shall automatically suspend the operation of the ordinance in question pending repeal by the Commission or final determination by the electors as the case may be. An ordinance adopted by the electorate through initiatory proceedings may not be amended or repealed by the Commission for a period of two (2) years after the date of the election at which it was adopted. Should two (2) or more ordinances adopted at the same election, have conflicting provisions, the one receiving the highest vote shall prevail as to those provisions.