Abbie,
Thanks for replying - the question is asking whether there is a system bug that causes this rather than whether someone else can get in and change the voting rules.
I am expecting there might be a system deficiency to watch out for as I didn't set it to one vote but to unlimited voting. So finding out if there are other reports of this is a step in finding a possible answer.
And also, how do I report possible deficiencies - is it here?
Thanks,
Marilyn