Duplicate poll on most recent poll block

After create a poll, in this poll page (node/xxx), you will see the most recent block has 2 duplicate most recent poll, the cause here is when building the node view page, we already alter the node data (node->body) and in the block building process, we alter again, make the node data duplicate. To solve this problem, we just change the node_load() uses from node_load($nid), cached version, to node_load(array('nid' => $nid)), not cache version.