...
It is possible on occasion, normally due to an error with Turnitin, that assignments within an inbox can appear in duplicate. In this case DO NOT delete either assignment as this will in fact delete both the duplicate and the original. The assignment is not actually duplicated, it simply is displayed as such. To rectify the issue you should display all of the assignments, then filtered by the paper ID. Next scroll down the list looking for duplicates (comparing the final number can be a good way to do this). When you find the duplicate, refresh that assignment by clicking on the refresh icon to the right of it. This will rectify the issue and you should see the number of submitted assignments decrease.
...