Hi Jamie

First up we are trying to get bug reports moving through the helpdesk system from now on as it is very difficult to keep track of bug reports on forums. The forums should be for general chat, sharing info with other partners, discussion on future features, that sort of thing, but anything that actually needs investigation or action by the Totara Core team should be going through helpdesk.totaralms.com so we can track it to resolution.

The question here as a temporary fix is whether there are multiple records for the same user in the upload file, or alternatively whether there are users in the upload file that have already completed the course. There was a similar issue with certification completion uploads with multiple records for users in the same upload file a few months back, so this may be related.