This can happen from time to time.

To get rid of those "Zombie" enrolment files, should you have them, please download the file, but do not import it.

The steps are as follows:

1.  Download the file. This will clear it from the download list.

 

2. Un-tick the Import Option on the file, then press 'OK'

 

3. Click on 'Web' > 'View downloaded files' (1)(2), adjust status of the enrolment to Cancelled (3)