Why aren't multiple choice polls working?

Why aren’t multiple choice polls working?

When i try to vote more than once on this poll it won’t let me.

Works correctly for me. I’ve just selected both Yes and No above and both options are registering as being made

Once you have voted you shouldn’t be able to vote again.

What is not working ?

Thanks, it must be just me then. I’m using Firefox, and when i vote once it says

You have already voted on this poll

Sorry, can you delete these posts about polls please?

https://blenderartists.org/forum/showthread.php?402874-don-t-vote-yet!

I’m trying to set up a multiple choice vote for the Blender game making contest. But I can’t get it to work and I can’t delete my own posts.

It’s broken because I can select two mutually exclusive answers…