All the Instadigi script does is syndicate data from sites (live.com, yahoo, answers.com, etc.) and convert it into a forum-based thread/post format. The OUTPUT of each query depends on the keywords that are used. If the same keywords are used more than once, there is a high probability of duplicated content being posted. This is a common occurance in versions 1.0, a fix has been implemented in version 1.1+ to fix this issue, allowing users to choose whether to allow duplicate posting.