For info from the 11 October 2018 a code update introduced a bug where the script would add duplicate tweets to your archive. I’ve hopefully resolved this issue and pushed an update. There no need to do anything as the script will use the new code, but if your archive has become a mess you could download an earlier commit of your archive and rollback to this version (as long as you’ve made less than 3,200 tweets since the rolled back version the script will be able to collect all the data).