Should you notice that duplicate tests are being provisioned, note the sub-types (a.k.a. categories) of these tests. Review the signature files under both 'TRAVERSE_HOME\plugin' and 'TRAVERSE_HOME\etc\typedef' to determine if these sub-types are defined in more than one signature file.
Note: Traverse upgrades will overwrite files under 'TRAVERSE_HOME\etc\typedef\', and not the folder itself. So if there is a signature file in this folder that is not included in the Traverse installer, it will be retained after the upgrade.