I've been using WP-Polls for years.
At some point, prior to WP 2.9.2, I noticed that all the short codes for poll insertion would result in a different poll showing up, not the intended one.
I thought it was a DB error as the same thing was happening with comments and comment counts (strangely enough, a comment on post 50 would result in it showing up on a completely different post).
I upgraded to 2.9.2
currently, WP-Polls is still not showing the correct poll as indicated by the shortcode.
It's only showing the most recent poll.