I think if you look closely, the two members that were
appointed, were
specifically not appointed with a renewable term, but appointed *until*
the next elections.
I believe they were replacing elected board members that had resigned,
so they were appointed to elected seats which were empty at the time.
It makes sense that their appointment is only until the next election.
That's not the case with the treasurer position - as far as I know,
that is intended to be permanently an appointed seat.