Polls reset after 1 week?

Hi
It llok to me like the polls get reset after 1 week, is this correct?
What I mean is after one week, when I go back t my polling page, I am once again expected to vote. even though I voted last week.
The effect I would like to achieve is to have only the polls on which I heven't voted show as votable, and not the one I have voted on.
This seems to work during the week, but after a week. it seems to reset.

Hav ei just missed a setting?

Appreciate any help.

Thatpersontoo@yahoo.com