Majority Voting

Hi

Have been on executive committees for many years both in and out of strata.  I thought I had seen it all but apparently even I can be shocked,

We had a meeting the other week and one of our members had resigned due to ill health so now we have a committee of six.  There was an election to fill the casual vacancy and the outcome has created shockwaves. 

I have always used Robert Rules but was informed by my strata manager this was not in use anymore.  The situation is there are six votes – 3 for the motion, two against the motion and one abstainer.  Under Roberts and my opinion this is not a majority – a majority is four.

Am I wrong?  The SM says I am.  Help please