At an AGM an owner voted against the approval of the Agenda – if he then continues to vote on other resolutions on the agenda is this allowed?

Any vote exercised on an item must be counted, except if the person was not authorized to vote – i.e. not a member, not a proxy holder, indebted to the body corporate with a CSOS or Court Order against them. 

If the vote of the agenda went to a vote and the majority voted for it, the meeting proceeds.

If one or more owners vote against the agenda, it doesn’t remove their right to vote for other items on the agenda

If the majority of owners vote against the agenda, it is not the meeting they are voting against, it is the agenda, and the objection must be established and dealt with such that the meeting can continue