I'd like to re-open this bug report as it's just happened again. I have set up a fresh install of 2.0.2 with no mods installed to test the bug. Heres how it occurs.
Create a new default registered user.
Log in as the new user and create a poll with a set voting length and click the third radio button to not allow users to see the results until the poll has ended.
post the poll
edit the poll
The third radio button is still the default option. it's also greyed out but this is easily missed.
Once the poll is edited all users are now able to see poll results! clicking edit again now sees button 1 as the default option but the third radio button is stilled greyed.
The administrator can change the options but the OP cannot.