Schedule 2 of the strata act says
17 Counting of votes on election of executive committee
(1) An election of members of the executive committee is to be decided according to a majority in number of the votes cast at the election with a person entitled to vote having one vote for each lot in respect of which the person is entitled to vote, unless a poll is demanded by a person present and entitled to vote at the meeting.
And if the intial decisions was to have 3 members I would assume you would need a motion on the Agenda to change this and that motion to be approved by a vote and untill that happens you need a committee of 3.
Do you have a SM or is it self managed??
From what you say I would expect the current committee to be invalid and unable to perform their duties as they were not duly elected. (advise them (and SM) that any spending they authorize might have to come out of their own pocket not the strata funds as they have no authority to spend strata funds).
Also before the agenda was sent out a request should have been sent round to all owners inviting them to submit motion and put their names forward to be on the committee.