If you've enabled voting for anonymous users [3]. You should disable the page cache for pages containing a poll node.
This piece of code will disable page cache for all nodes of type poll. You have to do it in hook_init(). (Place it in a module)
function thuis_hoftersmissen_extra_init(){ if(arg(0) == 'node' && is_numeric(arg(1))) { $node = node_load(arg(1)); if ($node->type == 'advpoll_binary' || $node->type == 'advpoll_ranking' || $node->type == 'poll') { $GLOBALS['conf']['cache'] = FALSE; } } }
Links
[1] https://dominiquedecooman.com/blog-topics/caching
[2] https://dominiquedecooman.com/blog-topics/poll
[3] http://dominiquedecooman.com/node/188